Bosch 0 258 006 537 Oxygen sensor for VAZ niva 1.7 i (vaz-21214)

What should you do when your car suddenly loses traction or begins to consume gasoline at too high a rate? An experienced technician will tell you that the problem is with the lambda probe and it needs to be repaired or replaced. Owners of foreign cars are especially susceptible to this problem. And really - what to do in such a situation? After all, you yourself understand that nowadays auto parts are not cheap. Is it possible to prevent the breakdown of a lambda probe, what are the signs of a malfunction of a lambda probe, and what is it? Let's look at everything in order.

The main symptoms of a malfunctioning lambda probe

Among the signs that allow you to determine in advance whether the probe is working or not are the following:

• The appearance of instability during engine operation (the engine begins to rapidly gain speed and also stalls sharply);
• Deterioration in the quality of the fuel mixture pumped by air into the cylinder system (this leads to excessive consumption of fuel);
• Uncontrolled and ineffective fuel supply (malfunctions in the operation of the engine and electronic system of the machine);
• Gradual appearance of intermittency in engine operation at idle speed;
• Reduced engine efficiency at maximum speed;
• Problems in the operation of electronic systems (faults in the sensor lead to unstable operation of the engine compartments, since the fault signal is transmitted with a delay);
• The presence of periodic “twitching” of the car;
• The appearance of strange pops when the engine is running;
• Untimely (slow) response of vehicle engine systems to pressing the accelerator pedal;
• The appearance of a constantly flashing light indicating a sensor malfunction on the central instrument panel.

If you find one or more of these reasons in your vehicle, you should consider replacing this device.

Detailed problem definition

Common signs of a malfunctioning lambda probe include the following:

• increased fuel consumption;
• the occurrence of jerking while driving;
• a sharp decrease in the power of the power unit;
• unstable idle;
• the appearance of a sharp, toxic odor in the exhaust gases of a car.

It must be emphasized that the symptoms listed above are not always the result of a malfunction of the oxygen concentration sensor. If these symptoms are detected, the lambda probe must be thoroughly checked. Let's take a closer look at this process.

Where is the oxygen sensor located?

The main purpose of the DC is to assess the quantitative oxygen content in the exhaust gases and send data to the electronic control unit. The latter, based on the analysis, adjusts the position of the ignition angle. Thus, the combustible mixture becomes enriched and depleted.

Systematic operation, low-quality fuel, high temperature conditions are the main factors for premature failure of the mechanism.

The replacement process is not at all complicated, but requires care on the part of the repairman. However, here too, not many car owners are ready to buy original spare parts, preferring cheaper analogues.

To prevent the electronic control unit from identifying a system error, the lambda probe is replaced with one of the following types of decoys:

• Mechanical;
• Electronic.

On Chevrolet Niva models up to 1995. The controller is installed on the metal body of the exhaust manifold. The second generation Chevrolet Niva (after 1995) is equipped with two DCs: diagnostic and control.

The first is located in the exhaust manifold housing, the second is after the manifold coupling.

Access to equipment for preventive maintenance from under the bottom of the car, as well as through the top of the engine compartment.

The average service life of the recreation center is 80 – 110 thousand km. depending on the driver's compliance with the manufacturer's recommendations.

The symptoms are in many ways similar to other breakdowns, so it is important to correctly identify the breakdown at the initial stage.

• Difficulty starting the engine “cold” or “hot”;
• Increased fuel consumption;
• Power reduction;
• Passive acceleration dynamics;
• The engine is not running properly;
• An indicator on the instrument panel indicates the presence of system errors in the electronic control unit;
• Periodic shooting sounds are heard from the exhaust pipe, which indicates an enrichment (leanness) of the combustible mixture;
• Blue, gray, black smoke from the exhaust pipe.

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If one or more signs are detected, immediately contact a service station specialist for a comprehensive diagnosis.

• We install the machine on the inspection channel (pit);
• We turn off the engine, open the hood;
• We wait until the exhaust system cools down to a safe temperature so as not to damage the skin of the hands;
• Remove the limit switches;
• Use the key to “17” to unscrew the sensor;
• We screw in the DC, put on the terminals;
• We start the engine and check the functionality.

DIY replacement completed.

What is an oxygen concentration sensor used for?

In practice, many vehicle owners are not even aware of the existence of this element.
Its purpose is to determine the oxygen concentration in the exhaust gases and subsequently transmit this information to the ECU. Based on this, according to the algorithms embedded in the system’s memory, the fuel-air mixture is corrected for its complete combustion in the cylinders of the power unit. The location of the oxygen sensor is the exhaust manifold. On most models, the lambda is mounted directly in the area of ​​the catalytic converter. Regardless of where the sensor is installed, the correctness of its readings and system performance will not be affected. There are two types of lambda probe:

Note that the second type is included in the design of older vehicle models that were produced before the 90s. All modern models have a broadband lambda, which accurately records all deviations to ensure the most correct mixture formation. At the same time, a properly functioning sensor of such a system can actually reduce fuel consumption and ensure optimal crankshaft speed of the power unit.

Do-it-yourself controller diagnostics on a Chevrolet Niva

To check the equipment we use a multimeter. Most motorists have the device in their garage. The sequence of actions is as follows:

• We place the car above the inspection hole;
• Remove the limit switches;
• Connect the multimeter terminals;
• We activate the device to the “Resistance measurement” position;
• We analyze the received data.

If the arrow tends to infinity, the lambda probe is working; if the arrow drops to zero, the part is damaged. Remember that the controller is non-separable and cannot be prevented.

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Operating principle

Modern Nivas use BOSCH sensors 0 258 006 537; NTK:629-W2:8965 and others. These are zirconium elements that react to the volumetric amount of oxygen in the exhaust and produce an output voltage in the range: 0.1–0.9 V (high O2 content - low O2 content).

The operation of the device is based on the principle of comparing the amount of oxygen in the exhaust gases and in atmospheric air sealed in the internal chamber of the lambda probe. It has 2 platinum electrodes separated by zirconium dioxide, which are surrounded by different oxygen environments. The device starts working only when heated to 300 °C and above. When heated, zirconium acquires the properties of an electrolyte and a potential difference arises between the electrodes.

Therefore, during ignition, until the engine warms up and the oxygen sensor starts working, the fuel supply to the injectors is adjusted according to a cycle programmed in the ECU controller.

Repair or replace the lambda probe?

Just like replacing a fuel pump on a VAZ-2110, repairing a lambda sensor should be carried out at a car service center. However, in most cases, this spare part is completely replaced, since it simply cannot be repaired further. The problem is the high cost of original sensors from an official dealer.

As a result, most motorists decide to switch to using a universal sensor, which is suitable for almost any make of car and costs much less than its original counterparts. In addition, if you want to save money, you can purchase a lambda probe from disassembly. These are used sensors, but they may have a long warranty period. You can also immediately purchase a full-fledged model of the exhaust manifold, in which a lambda probe is already installed.

If the problem is only a small error in the operation of the sensor, you can quickly fix it yourself. The main symptoms of a malfunction are associated with its severe contamination when fuel combustion products settle. In order to understand whether the tightening of the cylinder head bolts affected the operation of the probe or not, you just need to show it to specialists at an auto center.

To dismantle the lambda probe, you will need to first warm up its surface to a maximum of 60 degrees. Then carefully remove it and additionally take out the protective cap. After this, you can begin cleaning with orthophosphoric acid, which helps to easily deal with any (even the most persistent) flammable deposits.

Warming up the surface of the lambda probe

Lambda probe device

At the end of cleaning the sensor, it is necessary to soak the spare part. To do this, you can use products for flushing the engine cooling system or just clean water. At the end of the work, be sure to dry the sensor and install it in its proper place.

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Results and conclusions

If you care about your car, then when the first signs of malfunction of the lambda probe appear, you need to check it and, if necessary, replace it with a new one. To save money, you can purchase a used oxygen sensor or a non-original analogue.

The exhaust system of vehicles has changed significantly over the past few years; several additional elements have appeared in its design that allow vehicles to be operated without violating International environmental standards.

For example, one of these elements is an oxygen sensor, the signs of malfunction of which should be known to every car owner. We will consider in detail the purpose, design features and common malfunctions of the lambda probe in this publication.

What and how can you check the lambda?

To check, you will need a digital voltmeter (preferably an analog voltmeter, since its “sampling” time is much shorter than that of a digital one) and an oscilloscope, if possible, the measurements will be more accurate. Before checking, you should warm up the car since lambda operates correctly at temperatures above 300C°.

We start the engine, do not disconnect the lambda connector. We connect the negative probe of the voltmeter (ordinary gauge) to the car body. We “poke” the positive probe on each wire contact and observe the voltmeter reading. When the positive heater wire is detected, the voltmeter should show a constant 12 V.

Detailed diagnostics

How to check the lambda probe (oxygen sensor) with your own hands? You can do this in two ways:

• Visually.
• Using a multimeter.

Let's look at the first method first. So, first we remove the connector from the lambda probe. We examine all contacts. The wires must not be broken or damaged. If the contacts do not fit tightly against each other, this issue needs to be corrected. Next, we check the oxygen sensor itself. A Priora, the signs of a sensor malfunction may include the presence of soot, must be urgently repaired.

This is due to the combustion of a rich fuel mixture. Because of this, the device becomes dirty and cannot quickly respond to all changes. If there are shiny deposits (this is lead), the oxygen sensor is replaced. Lead damages both the probe itself and the catalyst. What are the signs of a bad oxygen sensor? The presence of lead indicates the use of excess fuel additives or low-quality motor oil.

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Where can I buy

Spare parts and other products for the car are easily available for purchase at auto stores in your city. But there is another option that has recently received significant improvements. You no longer need to wait a long time for a parcel from China: the AliExpress online store now offers the opportunity to ship from transshipment warehouses located in various countries. For example, when ordering, you can specify the “Delivery from the Russian Federation” option.

Follow the links and choose:

Electric snag

The emulator has a microprocessor that corrects the signal for the ECU. The latter “believes” that the sensor is working and passes the data without interpreting it as an error.

In fact, there is no longer a catalyst in the design; instead, a section of the exhaust pipe is welded in.

The cost of the emulator varies from 1,500 rubles, which is 85–90% of the price of a new recreation center. Unlike a standard controller, the emulator has an unlimited service life.

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How to identify the problem?

Let's look at possible signs of a malfunctioning oxygen sensor:

• Increased fuel consumption.
• Jerking when moving.
• Noticeable drop in power.
• Unstable engine operation at idle.
• Increased toxicity of exhaust gases.

Note that these symptoms do not always occur specifically because of the oxygen sensor.

Therefore, having identified one of the above symptoms, we proceed to a more detailed check of the device. We'll look at how to do this below.

Diagnostics with a multimeter

How to check a lambda probe (oxygen sensor) with a multimeter? To do this, we need to connect the signal wire from the oxygen probe connector to our measuring device. Next, we start the engine and keep the speed around 2.5 thousand. Let's release the gas pedal. We pull out the vacuum tube from the fuel regulator and look at the readings of the device.

If the voltage is less than 0.8 V (or absent at all), signs of a malfunction of the oxygen sensor have been confirmed. There is no point in repairing it. Due to the design features, the element can only be replaced. The cost of this element ranges from two to three thousand rubles for VAZ cars. How to change the oxygen sensor yourself, see below.

Regulator check

If you suspect a regulator malfunction, it is recommended to start by assessing its external condition. In most cases, if the sensor is faulty, it will be covered in a layer of dirt or grime. A normal appearance of the sensor usually indicates normal operation, but testing should be continued.

• The regulator must be disconnected from the unit.
• Then connect it to a voltmeter with a fairly high accuracy class.

Note. The connection diagram of the regulator to the voltmeter should be based on its pinout: the black wire from the sensor is responsible for the signal (goes to the controller), the white wires are responsible for heating, the gray wire is for grounding.

Checking the voltmeter readings is a diagnostic based on the dynamics of the vehicle's power plant. For example, if cruise mode is engaged (2500 rpm) with the vacuum tube removed, a normally operating regulator should output 0.9 V (a little more or less). If the sensor readings are below 0.3 V, the device is clearly faulty.

The control sensor may have a different mode. You can simulate forced air intake, which leans the air-fuel mixture. In this case, the regulator readings should be less than 0.2V.

Another test mode is associated with the intermediate position of the motor. In other words, if the engine speed is within 1500 rpm, the regulator should show a value of 0.5 V.

If the sensor is completely faulty, it should be disassembled and replaced. And here you need to adhere to some rules.

1. It is better to change the regulator on a racing car, so to speak “hot”. This gives you a better chance of not breaking the threads.
2. It is also advisable to slightly raise the connector of the new regulator to protect the device from dirt and moisture.
3. And finally, experts recommend treating the sensor body with “graphite”, even with factory lubricant.

Almost all modern cars have an oxygen sensor. There are several ways to position the device. On some cars it is located next to the catalyst, on others it is in the exhaust manifold.

What to do if you find a faulty sensor on the road

If a sensor malfunction is detected on the road or you need to go somewhere urgently, but the problems with the sensor have not been resolved, what should you do? The solution is brilliant in its simplicity: you just need to turn off the probe. Of course, the flashing “control” will not go away until the engine stalls and the dynamics are, in principle, normal. But you can easily get to a car service station, even if without services.

It is necessary to install a sensor recommended by a specific vehicle manufacturer. By installing some kind of “sinister” device, even for reasons of economy, you can subject the engine to unbearable loads and problems. Undoubtedly, engine repair will cost much more than buying a high-quality oxygen sensor.

Engine operating principle

Detonation often occurs when going uphill. At the same time, the car moves slowly, and the speed is too high. But there is no need to worry, because this phenomenon is called glow ignition, it does not indicate that the engine is not working correctly.

Any gasoline engine operates on the following principles:

1. A mixture of gasoline and air is supplied to the combustion chamber of the cylinders, where it is ignited using a spark from the spark plug. Moreover, the piston should be almost a few millimeters from top dead center. When the piston reaches the top position, the greatest pressure appears in the cylinder. In this case, the entire fuel-air mixture will burn one hundred percent.
2. During normal operation of the knock sensor
   on
   a Chevrolet Niva,
   signs of this phenomenon will not appear. > myth device will help get rid of the manifestation of detonation. And it occurs when the mixture begins to ignite, much more than 30 years later than expected. Typically this happens halfway to top dead center. And when the fuel-air mixture burns, the upper part of the piston will be affected by a force that pushes it in the opposite direction. Here the engine power decreases, and significantly, and its parts wear out.

KEY-DOP

Causes and symptoms of problems

If the oxygen sensor fails, this affects the performance of the power plant. Failures are always accompanied by a decrease in the quality of the resulting fuel mixture.

Common reasons:

• mechanical damage appears, depressurization is possible due to improper operation or off-road driving;
• problems arise, power outages;
• thermal overload, overheating due to improper ignition;
• severe pollution due to the use of fuel that contains many additives that increase the octane number;
• air and exhaust gases may enter the system.

Typically, the probe fails gradually, which allows the problem to be identified in time.

Signs appear in sequence:

1. Displayed as unstable inactive. The reason is that no signal is generated at a certain time. Fluctuations can be severe over a wide range.
2. The quality of the air-fuel mixture decreases. This is accompanied by the appearance of jerks and unusual pops in the operation of the power unit. The dynamics are getting worse.
3. The corresponding warning lamp lights up on the dashboard, which is a signal to the owner.
4. If the situation worsens, the device stops working on an unheated engine.
5. Power and responsiveness drop noticeably when you press the gas. Popping and jerking sounds appear more often. Engine overheating is possible.
6. Fuel consumption increases, exhaust gases acquire a toxic odor.

In such a situation, it is necessary to replace the lambda probe, and signs of malfunction cannot be ignored. On new car models, emergency mode is activated, which makes further movement impossible. This eliminates the development of more serious engine problems and costly restoration.

Device diagram

Let's look at the probe diagram, which gives an idea of ​​the placement of nodes. Knowledge of the design allows you to understand the locations of parts that are prone to failure.

Probe design example

• 1 - metal fitting intended for installing a probe, there are turnkey edges on the outer surface, a thread is located below;
• 2 - ceramic insulator;
• 3 — sealing element for inserting the wiring harness;
• 4 - signal wires;
• 5 - metal protective cap, equipped with ventilation vents, designed to protect the measuring element from damage;
• 6 — spring contact part;
• 7 - sensitive element made of ceramic;
• 8 - heating rod;
• 9 - ventilation duct;
• 10 - outer metal casing.