Why is the oxygen sensor broken after the car is well maintained?

You can check and go to the car repair shop to issue a certificate, and if you can prove that it is caused by work errors during the maintenance process, you can make a claim.

Cars usually have two oxygen sensors, one front oxygen and one rear oxygen, the front oxygen is generally installed on the exhaust manifold, and the rear oxygen is installed behind the three-way catalytic converter, and their respective roles in the exhaust system are different.

The function of the front oxygen sensor is mainly feedback, simply put, it is to detect the oxygen content in the exhaust gas produced after the combustion of the cylinder mixture, generally the oxygen content is high and the mixture is thin, and the low oxygen content indicates that the mixture is too concentrated, and the front oxygen sensor transmits different electrical signals to the ECU according to the different oxygen content, so that the ECU can correct the mixture according to this information.

The function of the rear oxygen sensor is mainly to check the purification effect of the three-way catalysis, that is, to detect the oxygen content in the exhaust gas after purification, and feedback it to the ECU, and the computer will compare the data given by the pre-oxygen, if the data given by the pre-oxygen and the post-oxygen are the same (generally the pre-oxygen signal is greater than the post-oxygen), then the three-way catalytic failure can be judged, and the fault light of the engine will be lit at this time, reminding the owner to overhaul the three-way catalysis.

Common faults of oxygen sensors.

Poisoning malfunction. Oxygen sensor poisoning includes lead poisoning, which is often found in cars that run on leaded gasoline, and silica poisoning, which is a silica substance produced by the combustion of silicon compounds contained in gasoline and lubricating oil. If it is only a slight poisoning, it is enough to clean it up, but once the internal structure of the oxygen sensor is damaged, it needs to be replaced directly.

Ceramic chipping. The ceramic of the oxygen sensor is hard and brittle, and striking with a hard object or blowing it with a strong air stream can cause it to shatter and fail. Therefore, it is necessary to be especially careful when dealing with it, and replace it in time if problems are found.

Wire blocking burns. <>

The heater resistance wire is burned out, and if the heater resistance wire is ablated for the heated oxygen sensor, it is difficult to make the sensor reach the normal operating temperature and lose its effect.

The line is broken, and the internal line of the oxygen sensor is broken.

The quality of gasoline is not considered, and the oxygen sensor and the air intake sensor are not reported to be faulty, in this case, I think there is a high chance of problems with the ignition system. Of course, if it is an old car, there are many possibilities, such as punching the cylinder, burning engine oil, etc., which may cause the oxygen sensor to malfunction.

The function of the rear oxygen sensor is mainly to check the purification effect of the three-way catalysis, that is, to detect the oxygen content in the exhaust gas after purification, and feedback it to the ECU, and the computer will compare the data given by the pre-oxygen, if the data given by the pre-oxygen and the post-oxygen are the same (generally the pre-oxygen signal is greater than the post-oxygen), then the three-way catalytic failure can be judged, and the fault light of the engine will be lit at this time, reminding the owner to overhaul the three-way catalysis.

There are 2 oxygen sensors, one before and one behind, and after the front oxygen sensor fails, the accurate oxygen concentration cannot be read. Naturally, it is impossible to accurately stabilize the air-fuel ratio. The air-fuel ratio is out of tune, and of course the engine cannot function properly.

You can go after the maintenance shop and check the ignition system if it doesn't have anything to do with them.

After the front oxygen sensor failed, the exact oxygen concentration could not be read.

The main thing is to see how it is broken, if it is broken by the 4S store, they must pay for it.

This should be done first to ask where the maintenance is done, and then to check the ignition system.

I didn't calibrate the sensor after maintenance.

The maintenance of the oxygen sensor is not considered.

The electronic fuel injection system cannot obtain information about the oxygen concentration in the exhaust pipe, and thus cannot provide feedback control of the air/fuel ratio, which will make the engine.

Fuel consumption and exhaust pollution increase, and the engine has unstable idling, lack of fire, surge and other fault phenomena.

Oxygen sensor: It is used to determine whether there is excess oxygen in the exhaust gas of the engine after combustion, that is, the oxygen content, and convert the oxygen content into a voltage signal.

Transmitted to the engine computer, enabling the engine to achieve closed-loop control with the goal of excess air factor; Ensure the three-way catalytic converter.

It has the greatest rotation of three pollutants in the exhaust gas: hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOX).

chemical efficiency, and maximize the conversion and purification of discharged pollutants.

Fault handling: 1. Poisoning fault Oxygen sensor poisoning is a kind of fault that often occurs and is difficult to prevent, especially for cars that often use leaded gasoline, even if it is a new oxygen sensor, it can only work for thousands of kilometers.

2. The ceramic of the ceramic fragmentation oxygen sensor is hard and brittle, and it may be broken and invalid by hitting it with a hard object or blowing it with a strong air flow. Cause.

Therefore, special care should be taken when dealing with it, and the problem should be replaced in time.

3. The resistance wire is burned off and the heater resistance wire is burned, for the heating oxygen sensor, if the heater resistance wire is ablated, it is difficult to make the sensor reach.

to normal operating temperatures and lose its effect.

4. The internal circuit of the deoxidation sensor is disconnected.

The oxygen sensor detects the oxygen content in the exhaust gas and then feeds the data back to the ECU, which can adjust the air-to-fuel ratio of the slip family based on that data.

The oxygen return sensor is installed near the three-way catalytic converter, one oxygen sensor is installed in front of the three-way catalytic converter, and the other oxygen sensor will be installed behind the three-way catalytic converter.

The main function of the leakage oxygen sensor behind the three-way catalytic converter is to detect whether the three-way catalytic converter is faulty.

If the data fed back to the ECU by the two oxygen sensors is the same, it means that the three-way catalytic converter is faulty, and the fault light will light up on the instrument panel to alert the driver.

The failure of the three-way catalytic converter will lead to excessive pollutant content in automobile exhaust, affecting annual inspection and polluting the environment.

If the oxygen sensor is broken, the data cannot be fed back to the ECU, so the ECU cannot adjust the air-fuel ratio according to the data from the oxygen sensor, which will affect the power and fuel consumption of the engine.

When the oxygen sensor is damaged, the passenger can simply replace it with a new one.

Long-term use of oxygen sensors can lead to carbon deposits and lead poisoning.

Motorists can clean their oxygen sensors regularly, which can extend their lifespan.

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