Lambda probe is an oxygen controller. It is used to control and balancing the proportions of air and fuel in the formation of a combustible mixture. The correct functioning of the element will prevent the destabilization of the working process of the motor. To determine the cause of the breakdown, you need to know the signs of the lambda probe malfunction.

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External signs and reasons

If the heating system of the lambda probe or the device itself in the car does not work, the symptoms of the defective state will be as follows:

1. The power unit began to work less stable. Turns can spontaneously increase and fall. Motor often stalls, especially on traffic lights.
2. The quality of the combustible mixture has decreased, which rises with air into the cylinder system. If the serviceability of the sensor was broken, it will be the cause of fuel recalculation.
3. Fuel supply has become ineffective, fuel falls into the combustion chambers uncontrollably. This may lead to a malfunction in the work of the unit, as well as the electronic system of the car.
4. Over time, the intermittentness of the motor operation may appear when operating at idle. At the maximum - the efficiency of the engine is also less low.
5. There were malfunctions in the functioning of electronic systems. Due to the need to repair the sensor, individual power unit compartments will be unstable. This is due to the fact that pulsed fault signals are fed with a delay.
6. During the movement, the vehicle began to twitch. Especially when the car goes to the mountain.
7. When operating the engine on any turns, cotton can appear.
8. The engine has become a slowdown to react to the press of the gas pedal. Acceleration occurs, but not immediately.

One of the important symptoms is to light the indicator of the Angourt check or the light bulb of the oxygen controller on the instrument panel of the car.

The reasons for which the operability of the oxygen sensor will be broken, may not occur immediately, so the failure of the part occurs in several stages:

1. On the first begins to function unstable. Periodically, the signal from the device disappears, the information is supplied in an extensive range. This leads to a deterioration in the quality of a combustible mixture, as well as unstable turnover. At the initial stage, twitching the car occurs when moving uncharacteristic MOCs are manifested, the fault indicator may catch fire on the tidy.
2. At the next stage, the lambda probe stops functioning on a cold motor until the unit warms up. Symptoms of problems will be similar, only manifests themselves with greater force. The power of the engine motor can be reduced, response will appear when you press the gas pedal. As a result, this can lead to OVS overheating.
3. At the third stage, the oxygen sensor usually fails. The power of the power unit drops even more, it is clearly manifested when driving at high speed. An unpleasant and sharp smell appears from the muffler.

The reasons with which the oxygen sensor breakage may be associated:

1. There was a depressurization of the device of the device. Because of this, the spent gases and air began to enter inside.
2. Overheating controller. The reason may be associated with malfunctions in the operation of the ignition system or incorrectly performed tuning of the power unit.
3. Prolonged impact of external factors. This reason can be attributed to natural wear, since any oxygen sensor over time fails.
4. The operating surface of the oxygen sensor is covered with combustion products that block its operation. This is usually associated with regular use of low-quality fuel.
5. There was a violation in the operation of the power supply or damaged wiring leading to the central control unit.
6. Mechanical damage to the device. As a result of a strong impact on the body, the internal elements of the controller can be collapsed. This is often manifested with regular roadway driving.

The TV channel "Online Store Auto Parts" spoke about the causes of faults in the operation of oxygen controllers.

How to check the multimeter

Before the diagnosis of the oxygen sensor itself, its heating device is checked.

The tester can be checked for the operation of the heating component of the oxygen sensor:

1. The diagnostic device switches to the resistance parameter measurement mode.
2. The device's proves are connected to the heater contacts. These elements are usually made of a cable characterized by a large cross section.
3. Call contact of the heating device.
4. If the heating element is worker, then the resulting resistance value will be less than 10 ohms. If this parameter is higher, then the electrical heating device failed, it is required to replace it.

Tester check is performed as follows:

1. Find the location of the controller under the hood of your car.
2. Multimeter probe Connect to the signal outputs of the sensor or electrical caps. In the tester itself, the measurement limit is set to 2 volts.
3. At the next stage, it is necessary to artificially create a situation of a releasing combustible mixture. To do this, you can use the Peregazovka method, periodically clicking on the gas pedal. Either you can dismantle the pressure sensor connector.
4. Then the testimony that issued a tester is read. Ideally, they must compile from 0.8 volts, this indicates the health of the oxygen sensor.
5. It is necessary to artificially create a situation of a depleted mixture. To do this, you can make air seats, slightly weakening the body of the air duct. In the depleted mixture, the tester readings should be not more than 0.2 volts.

V_i_t_a_l_y spoke about the diagnosis of the oxygen controller using a multimeter.

Other diagnostic methods

If there are signs of a lambda probe malfunction, it is possible to use computer diagnostics to verify performance. It allows you to control the operating parameters of the oxygen sensor online.

You can use the oscilloscope for diagnostics. If the check showed that the lower limit of the device is reduced to zero volt, the controller is working, but soon it will be necessary to change it. If the curve of the time dependence of the voltage on the signal contact is characterized by a greater smoothness, then the sensor is already time to replace.

Properly start the diagnosis of four-pin oxygen sensors from a visual inspection, this procedure is recommended to perform every 10,000 mileage kilometers. The verification controller is dismantled from the collector, and it is impossible to use the WD-40 tool or braking fluid, since their hitting on the working surface will damage it. If special means apply when unscrewed the stalking threads, the remnants are removed before the removal of the device itself.

Rate the color, as well as the state of the oxygen controller working area. If traces of soot are visible on it, it speaks of a re-entered combustible mixture in the engine. Its presence leads to the contamination of the device, so it is necessary to remove so high in the device. A raid of gray or white color indicates the use of additives in a motor fluid or a combustible. The presence of a brilliant laid says that the lead concentration in the fuel is exceeded. If the raid is intense, then the sensor will not be repaired, it must be replaced.

Repair instructions and replacement of the sensor

With your own hands, you can replace or restore the controller.

How to dismantle the sensor

Removing the device, regardless of the model of the machine, is performed as follows:

1. Hell the surface surface of about 60 degrees. To do this, you can use the usual lighter or burner. Warming will make it easier to remove the device from the landing place.
2. Disconnect the wires connected to the part.
3. Carefully unscrew the oxygen sensor. Use special needs for dismantling is not recommended.
4. Remove the protective cap.

Dima Stepanenko told about the independent dismantling of the lambda probe.

Cleaning and soching

There are two options for restoring an oxygen sensor:

• first - using orthophosphoric acid;
• second - with orthophosphoric acid and burner.

It is necessary to take into account that orthophosphoric acid or other similar means refers to the category of hazardous substances. When working with a substance, it is important to remember the safety rules. It is impossible to make acids to the mucous membranes either into the organism.

First method

This method cannot be called accelerated, since the consumer needs to get a complete or at least partial access to the ceramic surface of the device. This component is hidden behind a protective cap made of metal, dismantling it is not easy. For removal it is impossible to use the hacksaw, because it will damage the working surface. The dismantling is performed using a turning machine - at the base of the oxygen sensor, it is necessary to cut off the protective cap using a cutter. Cutting is performed next to the thread.

If there is no possibility to use the machine, it is allowed to use a file. Fully remove the cap this tool will not be released, then it can make small windows with a size of about 5 mm. Approximately 100 ml of orthophosphoric acid is used for purification. In its absence, you can use the rust converter.

Recovery of the device:

1. Pour fluid into a glass container. You can use banks, glasses, etc.
2. Lower the core of the oxygen sensor in the container. Fully controller can not be lowered into liquid. Wait about twenty minutes.
3. Remove the sensor from the container, flushing its base with water from under the tap. Wait until the device is completely dry.
4. If the first time to remove the dark raid on the core did not work, repeat the procedure. It is necessary to ensure that the element is again metallic color.
5. If after several attempts to perform high-quality cleaning, it is possible to use a brush to enhance the effects. It is wetted and the base of the device is being processed. As a result, the flare must be removed. If the protective cap was dismantled, then the brush will not need. Instead, it is better to use a toothbrush.
6. After cleaning was fully completed, the sensor was washed. If the cap was dismantled, then after restoring it must be installed in place. For this, argon welding is applied.

When using this method, consider:

1. If the device is badly contaminated, then twenty minutes will not be enough to restore it. With critical clogging, the soching procedure can be increased to three hours. In some situations, cleaning may require a whole night, at least eight hours.
2. After cleaning, you need to check how efficiently the procedure was performed. For diagnostics, it will take a certain time so that the car owner understands how the car behaves and how much the fuel "eats". If the malfunction indicator remains on the tidy, then the controller did not work out.
3. If the machine is equipped with a sensor, the protective cap of which is equipped with a double shell, then make the hole in it will not be released. To solve the problem, it is necessary to soak the device in acid or another tool with the cap.

The process of cleaning the oxygen controller is shown by Alexander Sabegatulin.

Second way

To restore the controller, you will need the same acid, as well as the gas burner or a kitchen stove. When using a household stove, give preference to the small size of the burner.

Cleaning procedure:

1. Cover is removed from the burner. Then it turns over and is installed back, with a little displacement to the side. It is necessary to install the lid so that it covers the pipe itself from fluid ingress.
2. The fire on the burner is lit.
3. The lambda probe core should be dipped into the acid container, after which take it with the passatsia and heal on fire. This will lead to the boiling of acid, the substance will start splashing. A greenish tint salt will appear on the working surface of the device.
4. Wait until the substance is completely popped. Rinse the controller with clean water, and then repeat the cleaning procedure. These steps must be performed until the controller is completely glilate. This may take about ten minutes or more. Before further installation, the lambda-probe threads need to be treated with graphite lubricant, which will prevent the oxygen anticipation of the oxygen sensor to the threaded hole.

Installing a lambda probe

Installation of the device is performed in the reverse order:

1. A protective cap is installed on the sensor.
2. Wires are connected to the device.
3. The controller is installed in the seat and twisted.

How to make a corrector (cheating) lambda probe?

There are several types of proofreaders for oxygen controllers. The mechanical device is the most simple and accessible in terms of performing proofreaders. It is necessary to sharpen a special adapter, which establishes a lambda probe, as well as a mini-catalyst. After that, the collected device is mounted in the regular silencer seat of the machine.

If a catalyst device is broken or an oxygen sensor installed after it is broken, a signal will receive a signal. The module will be warned that in the exhaust gases contain harmful substances, the volume of which exceeds the permissible value. The control unit will perceive this event as an emergency and increase the fuel supply to enrich the fuel and air mixture.

When installing such a corrector, the exhaust gases will flow through a small adapter hole to the catalyst device. The latter is filled with ceramic dust with a catalytic layer. The concentration of malicious substances in the exhaust gases will be less. The control module will perceive it as the correct operation of the controller and the standard catalyst device. The manufacture of the bellows is performed using a lathe and the diagram, the use of steel or bronze is allowed as a material.

Mechanical Corrector Scheme for Lambda Probe

Universal drawings that can be found on the network may not suit for the manufacture of lambda probe decks to a specific auto model, you need to look for a proven option.

Manufacture of electronic controller flavors:

1. Using the program, the sprints and printer prints the drawing of the wiring and location of the schema elements. Printing is performed on glossy paper.
2. When sending a file to print for a layer K1, you need to choose a black color by 100%. In the program, check the box opposite the items of the mirror and circuit circuit. All other layers are removed.
3. Then goes on printing the following layer. For the layer M2, black color is indicated. The tick opposite the item is mirrored, but it is left in front of the second element. Other layers are cleaned.
4. When performing the task, foil textolite is recommended. It must be one-sided, and its thickness will be at least 1 and no more than 2 mm.
5. When the printout is on hand, it must be transferred to the LM324 board using an iron. The board itself is cut with dimensions, and in its contour it is necessary to make printouts. After cutting, attach the diagram to the drawing, the dimensions must completely coincide.
6. Using fine-grained emery paper, the copper layer is performed. With a fuel or solvent, cleaning the board is cleaned.
7. Then it is necessary to transfer a printout with tracks to the working surface. A printed layer of elements is installed on the reverse (copper surface). For this, foil paper is applied to the board and warms up the iron, the procedure takes no more than 10 minutes. When warming the surface surface, you need to press the board as much as possible. As a result, the toner should be reprinted with a foil surface on the scheme. If the density of the paper is low, the tracks will be shunning. The problem can be corrected using a permanent black marker.
8. The next step will be etched, this requires a chlorine iron or sodium perchlorate.
9. Then the holes are drilled on the board, the soldering elements are performed.
Connection of all components on the fee

How much is?

The cost of the device will be different depending on the manufacturer and the brand of the machine.

Video "Installation of mechanical decking lambda probe"

The channel "Replacing the oil and other species" told about the independent installation of the mechanical corrector of the oxygen sensor.

Lambda probe is a device that recognizes the composition of exhaust gases to control the nature of fuel conversion in the engine. This is a multicomponent device, its constituents are made from heat-resistant materials. The device is installed in front of the exhaust system catalyst, and it starts to function at high temperatures. Sometimes sensors are two - before and after the catalyst.

As the device heats up on its electrodes, the output voltage occurs. Then the lambda probe measures residual oxygen in auto exhaust gases. If its value deviates from the norm, the signal is fed to the ECU, which restores the composition of the fuel-air mixture.

Blende - Detail that complements the device corrects the signal coming from it. There are two species - mechanical (gas passes through it and oxidized, the volume of oxygen decreases, the ECU receives a more correct value of the indicator) and electronic (Supports the operation of the auto power unit adjustment system, analyzes the real exhaust composition, based on which the signal applies the resulting computer; as a result, the engine operates in normal mode, despite the defective catalyst or absence).

The lambda probe is narrowband and broadband. In the first case, it is capable of analyzing only the regular values \u200b\u200bof the voltage, which can lead to disorders of the engine due to the incorrectly altered concentration of fuel in the fuel mixture. Broadband consists of two-point and pumping elements; Oxygen from the exhaust system under the influence of current force; holds a constant voltage between the electrodes, and if it grows, a signal is supplied to the computer; After that, the block adjusts the composition of the fuel mixture.

Scheme of a narrowband lambda probe

The difference between the broadband probe from narrowband It is that it measures the oxygen concentration in exhaust gases on any engine revolutions. Its range from 0 to 5 volts. In narrowband, it is only 0-1.

Oxygen sensor It works for 500,000-100,000 km run. If there is no low-quality gasoline into the tank several times, the sensor may fail at the system almost immediately.

If the heated lambda probe does not workThe device does not feel problems with the composition of the fuel mixture. And the engine will work with an increased load, and the toxicity of exhaust gases will increase dramatically. Like fuel consumption.

Consequences breakdown: The engine will start functioning unstable even at idle, the fuel consumption increases, the poor purification of exhaust gases is soldered; Auto moving jerks, badly listening; Motor power decreases.

How to understand that the device broke: The car in motion begins to twitch; From under the hood, uncharacteric sounds are coming; The indicator is lit on the dashboard; The engine power drops, and the accelerator pedal works slower; A sharp and unpleasant smell appears from the exhaust pipe; Motor overheats. With full failure, the car may not go.

Read more in our article on how the lambda probe works.

Read in this article

What a lambda probe device

In modern cars, many sensors are installed, which not only allow it to better control the operation of its different systems, but also increase the eccoperation. One of the devices is a lambda probe. The device recognizes the composition of exhaust gases to monitor the nature of fuel conversion in the engine.

If the combustion and air ratio ceases to be optimal, the sensor informs the electronic control system control system. He gives the composition of the mixture to normal by reducing or increasing the volume of fuel supplied.

How the lambda probe works in the car

To figure out how the lambda probe works in the car, you need to understand what it is made. This is a multicomponent device, its constituents are made from heat-resistant materials. The device is installed in front of the exhaust system catalyst, and it starts to function at high temperatures. Sometimes sensors are two - before and after the catalyst.

As the device heats up on its electrodes, the output voltage occurs. And the lambda probe acquires the ability to measure residual oxygen in car exhaust gases. If its value deviates from the norm, the signal is fed to the ECU, which restores the composition of the fuel-air mixture.

What is cheating and what it is needed

One of the breakdown can affect the exhaust system catalyst, after which the release of exhaust gases increases. It can be removed or replaced by a flamesector. But the engine begins to work in emergency mode due to the incorrect lambda probe signal.

Recovery from this can be deception. The part complements the device, corrects the signal coming from it. Flacks are two types:

• Mechanical. Gas passes through such a detail and oxidized. As a result, the volume of oxygen decreases, the ECU receives a more correct value of the indicator. The system provides information in the form in which it happens with a working catalyst well.
• Electronic. This is a more complex device based on the microprocessor. This is how the electronic type lambda probe is working: Supports the operation of the auto aggregate adjustment system, analyzes the real exhaust composition, based on which the signal applies to the eBU. As a result, the engine operates in normal mode, despite the faulty catalyst or its absence.

Electronic Deck Connection Scheme

What is broadband meaning

The devices are narrowband and broadband. In the first case, they are capable of analyzing only regular voltage values. That is, information transmitted at low engine speeds. Everything else reads with an error, and an absolute signal arrives on the computer. This can lead to engine disorders due to incorrectly altered concentration of fuel in the fuel mixture.

How the broadband lambda probe works:

• consists of two-point and pumping elements;
• due to this structure, oxygen from the exhaust system is obtained under the influence of current;
• holds a constant voltage between the electrodes, and if it grows, a signal is supplied to the computer;
• after that, the block adjusts the composition of the fuel mixture.

Scheme of the Broadband Oxygen Sensor

The difference between the broadband probe is that it measures the concentration of oxygen in the exhaust gases on any engine revolutions. Its range from 0 to 5 volts. In narrowband, it is only 0-1.

Whether lambda probe works without catalyst

The failure of the catalyst of the exhaust system (exhaust cleaner) is one of the frequent problems that causes complexity with the operation of the engine. It happens if the controlling sensors are two: one is installed before the device, and the other after it.

In this case, the oxygen content in the exhausts passed through the catalyst will change. It will detect the sensor standing after it. He will transmit a false signal to the ECU on the need to correct the composition of the fuel mixture. And in this case, the answer to the question whether the lambda probe works without a catalyst, negative. After all, it gives a signal based on distorted information. Here you need to put a snag.

Another option is to make a brain flashing auto, change the catalyst on the flame and remove the sensor. Otherwise, problems with injection will begin, which can lead to high gasoline spending, an increase in the load on the engine, breakdown.

The oxygen sensor in some cars is located and only before the catalyst. Then the lambda probe analyzes exhaust gases that have not yet passed through the cleaner. That is, the data is not distorted, the catalyst works or not. With a breakdown of the cleaner, only the number of poisonous gases from the exhaust pipe increases.

How much it works at all

Oxygen sensor is one of the most sensitive components of the machine. It is enough for 500,000-100,000 km run. But how much lambda probe works, also depends on:

• operating conditions auto;
• engine service;
• type of device (unheated, heated, planer);
• fuel quality.

The last factor is especially important. If there is no low-quality gasoline into the tank several times, the sensor may fail at the system almost immediately.

See this video about how lambda probe works:

If heated does not work

The oxygen sensor begins to analyze the composition of the exhaust after itself heats up to 300-400 degrees. If the heated lambda probe does not work, the device will not feel problems with the composition of the fuel mixture. And the engine will work with an increased load, and the toxicity of exhaust gases will increase dramatically. Like fuel consumption.

The output will only be replacing the sensor completely or its removal along with the brain firmware of the machine.

Consequences breakdown

The oxygen sensor malfunction will pernicably affect the engine. It will start functioning unstable even at idle. When the lambda probe does not work, the consequences are also:

The engine power drops, and the accelerator pedal when exposed to it works slower;

from the exhaust pipe appears a much more sharp and unpleasant odor than before;

motor overheats.

For these changes it is not difficult to understand how defective lambda probe works. If he finally failed, the car may not go. When the brain sensor is deployed, the machine receives many signals about problems, and the injection control system is blocked.

If you briefly talk about how the lambda probe works, it continues the engine in working condition longer, saves fuel, reduces exhaust toxicity. It is necessary to regularly check it with a specialist, follow the quality of the fuel and the cooling system of the motor. And when the sensor fails, be changed it.

Useful video

See this video about how to correctly check the lambda probe:

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Modern cars are equipped with electronic fuel injection systems with the possibility of adjusting the composition of the mixture. In the event of a device breakdown, knowledge of the signs of a lambda probe malfunction will help determine the cause of the problem.

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Description of the device and where is located

With the advent of electronic gasoline injection systems in front of the designers, the task of adjusting the composition of the fuel mixture was faced. To do this, began to be applied. The devices maintain the composition of the fuel mixture in certain converters, which makes it possible to ensure the maximum efficiency of the catalytic neutralizer. With the other compositions of the mixture, the neutralizer begins to work incorrectly and fails.

Depending on the design of the exhaust system, one or two sensors are used:

1. The first is installed directly in the exhaust manifold and measures the composition of exhaust gases in front of the catalytic neutralizer. In earlier systems, this device was the only one.
2. With the introduction of Euro-3 standards, the second probe was used, located after the neutralizer. Analyzes the data from two probes and indirectly assesses the efficiency of the catalyst, and also adjusts the composition of the mixture.

Variants of lambda probes

Manufacturers installed for products service life:

• probe without spiral heated - no more than 80 thousand km;
• heated knot - up to 100 thousand km;
• planar (broadband) probes - up to 160 thousand km.

The stated resource of probes is not accurate. The service life depends on the set of factors and may be less than or more specified values.

Device scheme

Consider the probe scheme that gives an idea of \u200b\u200bthe placement of nodes. Knowledge of the design allows you to understand the location of parts subject to breakdowns.

Example of probe design

The design includes:

• 1 - metal fitting designed to set the probe on the outer surface there are turns of turnkey, the thread is located below;
• 2 - ceramic insulator;
• 3 - sealing element for entering the wiring harness;
• 4 - signal wires;
• 5 - a metal protective cap equipped with ventilation products is designed to protect the measuring element from damage;
• 6 - spring contact part;
• 7 is a sensitive element made of ceramics;
• 8 - heating rod;
• 9 - ventilation channel;
• 10 - outer metal case.

The main features and causes of lambda probe fault

The main signs of the lambda probe fault:

• interruptions in work and floating speed at idle or low rates of the shaft;
• reduction of accelerating parameters of the car;
• noticeable (sometimes into several liters) increase in fuel consumption;
• enabling the check engine indicator and the appearance of errors in the memory of the control unit.

The causes of the oxygen sensor fault may be:

• damaged sensitive element;
• clogging of the working area of \u200b\u200bthe probe of soot or lead;
• wiring;
• the failure of the heating element.

How to check the oxygen sensor?

If the above problems occur above, it is necessary to check the condition of the oxygen sensor. Checking the lambda probe is performed by the visual method and using electronic equipment.

Visual inspection

The very first stage of verification is an external inspection of the part, which consists of stages:

1. Conduct a visual inspection of wiring and plugs. Invalid isolation, mechanical damage, oxidation of contacts.
2. On the working surface of the sensor there should not be plated soot and soot. Sawing layer occurs when wearing piston rings or poor valve tightness. Coal changes the sensitivity of the probe that transmits incorrect information to the engine control unit. After cleaning, the details are restored. Cleaning is made with a soft brush and withstanding the probe in orthophosphoric acid for 15-20 minutes.
3. If white or light gray sediments are present on the surface of the sensitive element, it indicates the use of fuel with addresses based on tetraethylswin. As a rule, such a sensor quickly fails.

The external inspection of the lambda probe allows you to determine only a small part of the faults, a more thorough analysis is performed using a tester or a multimeter.

Checking multimeter

The device can overcome the heating chains or the destruction of the working element starts. These faults can be detected using electronic test devices.

There are three varieties of lambda probe plugs:

• two-wire (grounding and signal);
• three-wire (added positive power supply of the heating element);
• four-wire (there is an additional grounding of the heating spiral).

To perform a lambda probe check, the factory documentation is required to determine the purpose of the wires and the digital multimeter, switched to the voltmeter mode and the ohmmeter.

Approximate sequence of actions:

1. Heat the engine to operating temperature, since only in this case it is possible to remove correct data.
2. Cut the heating chains. Under normal conditions, resistance is within 2-15 ohms, more accurate data can be obtained from reference literature. The resistance is measured by connecting to two pins in the plug (for a four-wire probe) or to a heater pin and the car body (in three-wire). If the resistance is zero, it means that a short closure of the heating element windings was revealed. The striving of resistance to infinity is the symptom of the cliff of nichrome yarn of heating.
3. Cut the wiring that goes to the heater from the control unit, on the absence of discontinuities.
4. Check the voltage in the signal circuit. The negative signal may be taken from the car body or directly from the battery terminal. Before checking the engine should work on medium turnover (2500-3000 rpm) for 2-3 minutes. Disconnect the plug and connect the test instrument.
5. Turn the speed to 2500-2600 rpm and sharply throw the gas pedal. The voltmeter readings are in the range of 0.2-1.0 volts and change with a frequency of 1 Hz (on average once per second).
6. Turn off the vacuum tube from the pressure regulator to check the degree of depletion of the mixture. Perhaps a compulsory depletion of the mixture by closing the height of the throttle knot. Check out the stress, which should be within 0.2 volts or below.
7. Install the tube back.
8. Radically raise turnover to the maximum. At the same time, the voltage should be about 1 volt.

An indirect sign of the non-working capacity of the probe is a stable voltage of about 0.45-0.5 volts, which does not change from the mode of operation and composition of the mixture. However, it is recommended to conduct a thorough check of the oscilloscope or test computer to confirm the breakdown.

Check using an oscilloscope

The advantage of testing the probe oscilloscope is the ability to control not only voltage values, but also amplitude changes in time. Shifts of amplitude characteristics in small limits cause a change in engine operation parameters, but not registered by the control unit as an error. The oscilloscope check is carried out in the conditions of a specialized service, since in personal ownership the device is rarely found.

Sequencing:

1. Heat the engine.
2. Connect the oscilloscope conclusions to the sensor.
3. Conduct testing at idle. Below are the exemplary curves taken by the oscilloscope. According to the amplitude of the signal, you can conclude the status of the part.
4. Change the damaged part and re-test.

Examples of graphics shot by the oscilloscope

How to check the sensor using the ELM327 USB OBD II scanner

The owner may independently test the sensor using the ELM327 scanner operating under the OBD II protocol. The device is compatible with most Russian and foreign-made cars.

Test sequence:

1. Connect the tester to the diagnostic connector. The location of the connector must be clarified by the documentation attached to the car.
2. Read the work parameters and transfer them to a laptop with pre-installed special software. The most common Torque Pro utility, which is in open access.

Below is the video tutorial on the ELM327 scanner with the Torque Pro utility provided by the Savontiy Channel.

Instructions for replacing the sensor with their own hands

Before starting work, it is required to prepare materials and tools:

1. New probe.
2. Wrench or nozzle that allows you to unscrew the sensor housing from the collector. On some cars, you can try to remove the device with a regular horn key on a 22 mm or gas adjustable key. But the main part of the cars requires the use of a specialized nozzle.
3. Extension for nozzle.
4. Dynamometric key up to 50-100 n / m.
5. Protective gloves and breakers, because work is made on the heated manifold.
6. Wrench keys to dismantle protective heat-insulating screens and / or collector.

The lambda probes should be changed on the same model or similar, suitable by parameters. Install the first sensor caught. Before installing, you need to carefully examine the instruction attached by the manufacturer.

Approximate sequence of actions when replacing the first probe:

1. Heat the power unit to the operating temperature. In this case, the thermal expansion of the elements of the exhaust system occurs, which makes it easy to facilitate the task of unscrewing the sensor from the collector or exhaust pipe.
2. Turn off the engine.
3. Remove the terminal from the battery to exclude the likelihood of starting the electrical fan of the cooling system.
4. Gently disconnect the probe connector with wiring.
5. Wear protective gloves and remove the probe wire from the clamps.
6. With the help of the nozzle unscrew the probe. At this stage, difficulties are possible, since the probe and collector's joint is clogged with rust and burnt lubricant. To facilitate the process, local heating gas burner can be used, which allows you to burn rust. After that, you should try to move the probe from the scene, if the item has not started to unscrew - warm up to repeat again.
7. Wipe the installation site from the residues of the old grate lubricant.
8. Check for standard lubrication on the thread of a new probe. The tool may be included in the package in a separate bag. The lubricant is applied with a subtle uniform layer on the thread. It is strictly forbidden to apply to the protective cap, as this leads to the formation of a solid nagar and the deterioration of the parameters of the probe. If the car used the sensor fixed with two bolts, then they do not need lubrication.
9. Carefully spin the sensor in place by hand until it stops.
10. Tighten the probe with the key with the desired torque. Most manufacturers indicate the power of 40-45 n / m, but it is recommended to refine the value of the service literature. In the absence of a dynamometric key, the tightening is made by the reality of the probe 180º after twisting by hand until it stops.
11. Pour the harness to the locks, fasten with clamps if necessary.
12. Connect the battery and delete errors from the control unit. Errors are removed using a computer or in other way (depending on the brand and car model).

When installing the probe, you need to follow the tightening torque. Excessive force leads to the destruction of the probe body or thread breaking, the low moment is the cause of the breakthrough of exhaust gases and uneven warming up the part.

How to repair a lambda probe?

Lambda-probes positioners position details as non-resistent and not repaired. However, some car owners with a certain success try to disassemble and repair the sensors, collecting one workable from two or more damaged devices.

The car owner should remember that such a repair of the lambda probe is a temporary event. It is recommended to purchase a new sensor, and renovated to use as a spare.

Repair of heating element

Approximate sequence of sensor disassembly and repair with damaged heating element:

1. Carefully cutting the external body of the sensor.
2. The second sensor is collected in a similar way.
3. Remove the heating rods from the sawed housings. The whole device must be wiped from a car and dirt with dry matter. Use cleaning substances is not recommended because it is possible damage to the heater as a result of chemical reactions.
4. Install the heater in the probe that will be applied by car.
5. Swing the housing with a copper-phosphoric solder having a melting point of about 700 ºС. Gas jewelry burner is used as a heat source.
6. Check the product performance by the tester and set the probe to the collector. If the repaired device does not work, then you can try to change the heater again. Below are photos explaining the repair process.

Repair of faulty wiring

There are recommendations for installing an additional resistor into a heating chain when it is out of order. In the idea of \u200b\u200bthe authors, the resulting resistance should give a correct signal to the control unit and turn off the error information. In fact, it happens, but the lifetime of additional resistance ranges from several hours to several days. The resistor heats up to high temperatures may cause fire in the engine compartment.

To eliminate a malfunction associated with a broken wiring harness, as follows:

1. Silte the body on the top of the probe.
2. Dismantle completely old wires, since insulation is wearing and cracks over time.
3. Remove the pins donor from the donor with soldered wires. A donor can use any plugging block from available.
4. For further work, you must fall out of the pins connecting elements.
5. Collect a new wiring harness using a regular rubber seal from the probe.
6. Install on the ends of the wires captured connecting elements.
7. Connect the wiring with the lambda probe response cables.
8. Crouch Contacts and additionally suck with a refractory copper-phosphoric solder.
9. Equipping the case and place the place of entering the wiring harness into the sensor with heat-resistant sealant.

Cleaning from nagar and soot

Another option is to clean the measuring element from Nagara and soot:

1. Gently cutting the protective caps.
2. To withstand the sensor in orthophosphoric acid, then carefully consider Nagar with a brush. It is not recommended to make an effort, since the measuring element is extremely fragile.
3. If necessary, additionally clean the element by heating on the gas burner. The procedure should be done carefully because it is possible to crack the part. Recommended in a number of sources heating and cooling with cold water is prohibited, as this will lead to the complete output of the probe.
4. Collect the sensor back, connecting the parts with refractory solder or point welding.

How much is the oxygen sensor?

The cost of the sensor depends on the type of product and the prevalence of the model. Below are reference prices for devices used on some auto models.

Video "Check Lambda Probe"

Lambda Probe is a concentration sensor O 2 (or simply speaking - an oxygen sensor), which makes it possible to estimate the volume of unburned oxygen contained in the exhaust gases. These indicators are extremely important, since due to maintaining certain proportions of fuel and air, the most effective combustion of the fuel and air mixture occurs. The best relation is considered to be 14.7 parts of oxygen per 1 part of gasoline. If this ratio will be broken, then the mixture will be poor or, on the contrary, enriched, which, in turn, will affect the fuel consumption and motor power.

At least an externally oxygen sensor and does not look like a "vital" detail, it performs a very important function, so any malfunction of the lambda probe, the "symptoms" of which we will look at, should be immediately fixed.

Signs and causes of lambda probe fault

According to statistics, oxygen sensors fail gradually, so it is possible to identify its malfunction if you pay attention to the following "symptoms" in time:

• The speed at idle began to fall or "swim".
• The car is twitching, and after the start of the motor is launched uncharacteristic cotton for the engine.
• The power of the motor has decreased and a slow reaction is observed when pressed on the gas pedal.
• The engine is strongly overheated, and the fuel consumption has increased.
• The smell in the exhaust pipe has changed (exhaust gases become more toxic).

As a result of the sensor, the quality of the fuel mixture falling into the combustion chamber is deteriorating, due to which the well-established engine operation is disturbed. The reasons for this can be a lot:

• Incorrect operation of the heat circuit or the reduced sensitivity of the sensor tip.
• Low-quality fuel with a high content of iron, lead, oil decomposition particles and other harmful inclusions. All these substances are poured on platinum electrodes, which leads to a sensor malfunction.
• Problems with the layering system of lambda probe. If the heating stopped functioning as needed, the oxygen sensor will produce inaccurate data.
• Overheating of the controller housing. This happens if the ignition advance angle is incorrect.
• Worn oil surgery rings. In this case, a motor fluid is entered into the exhaust pipe, which affects the lambda probe.
• If a multiple engine start is often performed.
• The use of sealants (especially silicone) to install lambda probes.
• The level of compression in the engine cylinders is disturbed. In this case, the combustible mixture burns unevenly.
• Scored gasoline engine nozzles.

If you notice that lambda probe does not work, the symptoms should not be ignored, since otherwise you will provide a lot of problems with the car. The fact is that most modern machines are equipped with an emergency blocking unit that can work in the deadlock. However, the impossibility of further movement is not the worst. If the sensor is unloaded, then the injection system will be released and you will have to pay expensive repair more serious node.

Checking the oxygen sensor

Usually, the diagnosis of lambda probe is performed using a voltmeter and an ohmmeter or a multimeter that replaces both of these testers immediately. To check the control knob of the regulator, you must disconnect from the pad to contacts 3 and 4 connector (usually brown and white wires) and connect to their clips tester ends. If the resistance of the helix is \u200b\u200bat least 5 ohms, then this is a good sign.

Also checking the lambda probe by a multimeter allows you to find out the sensitivity of the tip of the oxygen sensor. To find out the thermoelectric parameters of the item, you must enable and warm the engine up to 70-80 degrees. After that:

• Bring the engine speed up to 3000 and hold this indicator for 3 minutes so that the sensor is warmed up.
• Connect the minus probe tester (signal wire) with a mass of the machine, and the second - with the output of the lambda probe.
• Check the tester readings, the data should vary from 0.2 to 1 V and update up to 10 times per second.
• Creamerly click on the accelerator pedal and release it if the multimeter shows the value of 1 V, and then it falls sharply on zero, then the lambda probe is in order. If the data on the tester does not jump when the pedal is pressed and released, and the indicators are about 0.4 - 0.5 V - this indicates the need to replace the sensor.

If there are no voltages at all, then, most likely, the cause of the fault lies in the wiring, so all the wires that go from the ignition switch to the relay are "ringing" by a multimeter.

Useful! To more accurately clarify the characteristics of the sensitivity of the lambda probe, professional equipment is required - oscilloscope.

If your car is equipped with a "smart" onboard system, then pay attention to the "Check Engine" signal, which can be given the following errors:

• 0130 - indicates that the sensor displays an incorrect signal.
• 0131 - a very weak sensor signal.
• 0133 - Lambda slowly responds.
• 0134 - There is no response at all.
• 0135 - Lambda heater malfunction.
• 0136 - Grounding the second sensor closed.
• 0137 - The second sensor issues a very low signal.
• 0138 - Through-chore high signal of the second lambda.
• 0140 - Violation of the probe.
• 1102 - It is impossible to consider the indicators, since the resistance of the element is too low or no at all.

However, before checking the oxygen sensor, the lambda probe (video of this process is presented below) with the help of a special tester, pay attention to its appearance. If there are infrequent substances that impede its full work, it is possible to restrict ourselves to the repair of this element.

How to repair lambda probe

Repair Lambda Probe do it yourself quite simply, for this you need to determine which node failed.

If the problem is related to the contacts of the chain, then first of all it is necessary to find the place of gap and check if the contacts did not compound. The signal can, elementary, do not go from the control unit. Therefore, check the lambda nutrition. If the element contacts came together, they need to process WD40.

If there is a lot of cargo on the probe housing, then cleaning all parts of the system may be required. And then a natural question arises than washing the lambda probe. The fact is that processing platinum electrodes and ceramic rod sandpaper is strictly prohibited. Therefore, it is necessary to use specialized agents intended for dissolving rust.

To clean the sensor, you must perform the following steps:

• Remove the lambda probe, preheated its body up to 50 degrees.
• Remove the protective cap.
• Soak the sensor in orthophosphoric acid for 30 minutes (it can cope with the most complex sediments).
• Rinse lambda in water, dry and install the item back. Do not forget to lubricate the sensor thread with a special tool for creating full tightness (but not only use silicone sealant).

Since the cost of sensors ranges from 1000 - 3000 rubles per element, it is quite reasonable to try to repair the lambda probe with your own hands (see the video below), and then start the installation of a new item.

In custody

The car systems are very sensitive and need constant diagnosis and preventive work. To lambda probes and other elements worked properly, do not save on good fuel, because most often it is precisely non-dollar gasoline that leads to a rapid failure of important work items.

Lambda Probe is necessary for the normal operation of the system, providing control and correct formation of an air-fuel mixture in the car. It is located in the graduate manifold, where the nozzles are connected. But other accommodation options are not excluded.

Permanent loads, the effect of the aggressive medium leads to breakdowns, which is accompanied by malfunctions in the operation of the car. Avoiding problems is easier, periodically checking the oxygen sensor, signs of malfunction can also suggest the need to address the service.

If disorders are noted in the operation of the oxygen sensor, this affects the performance of the power plant. The breakdowns are always accompanied by a decrease in the quality of the fuel mixture formed.

Frequent reasons:

• mechanical damage appear, depressurization is possible due to incorrect operation, road traffic off-road;
• problems develop, power interruptions;
• thermal overload, overheating resulting from improper ignition operation;
• severe pollution due to the use of fuel, which contains many additives that increase the octane number;
• air, exhaust gases can enter the system.

Usually the probe fails gradually, which allows you to identify the problem in time.

Signs arise alternately:

1. There is an unstable idling. Cause - at certain points the signal is not generated. The oscillations can be serious, in a wide range.
2. The quality of the air-fuel mixture drops. This is accompanied by the appearance of jerks, uncharacteristic cotton in the operation of the power unit. The dynamics deteriorates.
3. The corresponding light bulb on the dashboard is lighting, which is the signal for the owner.
4. If the situation is exacerbated, the device stops working on an immentable motor.
5. The power drops significantly, responsiveness when pressed for gas. Cotton, jerks appear more often. The engine overheating is not excluded.
6. Growing the fuel consumption, exhausts acquire a toxic smell.

In such a situation, you need to replace the lambda probe, the signs of malfunction should not be ignored. The emergency mode is activated on new models, which makes it impossible to further move. This eliminates the development of more serious problems with the motor, costly recovery.

How is the sensor check?

The life of the sensor depends on the type of device and starts from 50,000 for the unheated, 100,000 for heated and 160,000 km for planar. If the first problems appear, you can check the condition of the device.

Visual estimate:

1. The presence of soot affects the signal transmission of the control unit. The reason is overheating, high oxygen content in the fuel mixture.
2. The formation of blessed and grayish sediments signals a large number of additives in the combustion, which affects the efficiency of the unit.
3. The brilliant glances suggest that the content of lead particles is increased in the fuel.

To determine the performance, obtain accurate information, professionals use special equipment. If it is not possible to go to the car service, it is enough to clarify how to check the lambda probe multimeter. It is easy to do it yourself.

Main steps:

1. The engine gradually warms up to 75 degrees.
2. Monitoring the gradual increase in revolutions to 3000, supporting the indicators for 3 minutes. It is necessary to warm the sensor.
3. Taking a multimeter, the signal wire is connected to the test device. The second wire is fixed by mass. With the normal operation of the sensor, the indicators issued by a multimeter remain in the range of 0.2 - 1 volt.
4. In the process of testing, the data should be constantly changing - when pressing the gas pedal to approach 1 volt, and when they are released quickly.

Thinking on how to check the lambda probe, take into account that if the instrument's readings do not change, the voltage of 0.5 volts is preserved when the gas is probably the node is faulty. At zero data, you need to make sure that the sensor is connected to the mass. It is recommended to check and integrity, the serviceability of the wiring leading to the ignition switch, relay.

Advantages of contacting car service

In the service station, the diagnosis is carried out using an electronic oscilloscope. It is advisable to do this after 30,000 km of run, which will avoid unforeseen breakdowns. To test the oxygen sensor of the lambda probe, experts comply with several important points.

Check in car service:

1. The sensor is warmed up to 300 - 400 degrees for normal operation and measurement of residual oxygen.
2. Thus, the electrolyte in the design of the device receives conductivity, and differences in the amount of atmospheric and oxygen in the exhaustion determine the appearance of the output voltage.
3. Disconnecting the plug, determine the resistance of the heater. The indicator should remain in the range of 2 - 14 ohms.
4. The voltage supplied to the heater is estimated. The optimal option is 10.5 ohms. The check is performed when the ignition is turned on with the probe connector connected.

The advantage of appeal to masters is to accurately determine not only performance, but also the state of the element.

Is it possible to clean the probe

If the oxygen sensor breaks, it is not necessary to do without it, since there is no methods for its recovery. Given the high cost of spare parts, the repair may be accompanied by considerable expenses.

But there are other options:

• pick up a universal sensor, which is significantly cheaper than the original, is suitable for most auto models;
• we are looking for a used part with a guarantee, a graduation manifold is suitable with a sensor installed.

But not always be sure to change the spare part. It is enough to know how to clean the lambda probe. After all, the situations of strong pollution are not excluded. On the sensitive element, covered with a protective cap, particles of soot can be postponed. Because of this, problems appear, errors. After removing the rotation, the efficiency of the device is restored.

Cleaning subtleties:

1. The procedure begins with dismantling, for which the surface of the part is heated to 50 degrees. Sealing the sensor, remove the protective cap.
2. The paper use orthophosphoric acid, capable of removing nagar particles, contaminants, without damaging electrodes, important elements. Moching is carried out for 10 to 20 minutes.
3. A more complex option involves removing the protective cap and the sink using the finest tassel. Removing contamination, the part is washed, dried.

The washing is carried out if it is possible to reverse the consolidation of protection involving argon welding. Cost of cleaning is much smaller than replacements. This solution is suitable only for good, but contaminated sensors. With the subsequent fix it is important to lubricate the threaded connection of the assembly paste. When installing a new element, the lubricant is not required, the connection is processed by production.

To understand what Lambda Probe is responsible for, it is worth paying attention to the operation of the fuel system. The oxygen sensor is an important element that allows you to maximize the efficiency of the motor on the injection machines.

High performance is possible with full combustion of air-fuel mixture. Therefore, it is important to determine the optimal proportion of the components. Thanks to the correct estimate of the oxygen content in exhaust, the following calculation of the composition of the fuel mixture is performed.

Operating probe provides:

• reduction of fuel consumption up to 15%;
• improving the ecology of exhaust gases;
• the factory resource of the catalyst is maintained;
• excellent dynamics are supported, responsiveness during management.

The best indicators are characteristic of cars with two sensors, where one is before the catalyst, and the second after it.

Studying the principle of working lambda probe, it is worth considering that the action scheme differs depending on the type.

Types of devices:

1. Two-point models in their design include two electrodes. This makes it possible to estimate the oxygen excess coefficient in the fuel mixture to determine its content in the exhaust. The action occurs during the passage of exhaust gases. Here, the first element is sensitive to oxygen. The second is made from zirconium. At the time of the passage of exhausts between the electrodes, the potential is measured. An increase in the indicator means an excess oxygen content.
2. Broadband represent a new type of probes. There is a voltage of 450 mV. The device includes ceramic components - two-point and pumping. The latter pulls oxygen in exhaust. This uses a certain current. The drop in the oxygen level leads to an increase in voltage, which is accompanied by the feeding of the corresponding signal of the ECU.

Care, timely diagnostics, troubleshooting makes it possible to exclude most of the unforeseen situations, maintain the factory resource, the functionality of the nodes.