Common faults of lambda sensors – ifm

Create Date: 2024-8-30 12:03:23|Source: IFM/ifm

1. Oxygen sensor poisoning.

Oxygen sensor poisoning is a common and difficult problem to prevent, especially in cars that often use leaded gasoline, and even new oxygen sensors can only operate for a few thousand kilometers. If it is only a small lead poisoning, then using a tank of unleaded gasoline can remove the lead from the surface of the oxygen sensor and allow it to return to normal operation. However, often because of the high exhaust temperature, the lead invades its interior, preventing the dispersion of oxygen ions, making the oxygen sensor fail, and then it can only be replaced. In addition, silica poisoning from oxygen sensors is also common. Generally speaking, the silica produced by the combustion of silicon compounds contained in gasoline and lubricating oil, and the silicone gas emitted by the improper use of silicone rubber gaskets will cause the oxygen sensor to fail, so it is necessary to use good quality fuel and lubricating oil. When repairing, it is necessary to select and install rubber gaskets correctly, and do not apply solvents and anti-sticking agents other than those used by the manufacturer's rules to the sensor.

Common faults of lambda sensors – ifm

2. Carbon deposition.

Because the engine combustion is not good, carbon deposits are formed on the surface of the oxygen sensor, or deposits such as oil or dust enter the oxygen sensor, which will prevent or block the external air from entering the oxygen sensor, so that the signal output of the oxygen sensor is inaccurate, and the ECU cannot correct the air-fuel ratio in time. Carbon deposition is mainly manifested in the increase in fuel consumption and the significant increase in emission concentration. At this point, if the sediment is removed, normal work will resume.

3. The ceramic of the oxygen sensor is broken.

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

4. The heater resistance wire is burned out.

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

5. The internal circuit of the oxygen sensor is disconnected.

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