The color of the oxygen sensor is poisoned, and the performance of the rear oxygen sensor is faulty

Oxygen sensor poisoning can be said to be the most common failure phenomenon. It is also divided into two types: lead poisoning and silicon poisoning. The former is often found in cars that use leaded gasoline, and the latter is a silicon dioxide substance produced by the combustion of silicon compounds contained in gasoline and lubricating oil. However, some friends can't tell whether the oxygen sensor is lead poisoned or silicon poisoned, so today we will answer this doubt.

In fact, we can judge the fault by observing the poisoning color of the oxygen sensor (the normal color is light gray). If it is a white top, it means that the oxygen sensor has been contaminated with silicon to a certain degree and needs to be replaced in time. If it is brown, it is caused by lead contamination, and it must be replaced. But if it is a black top, it is mainly caused by carbon deposits, so you only need to clean it.

Rear oxygen sensor failure performance

You must know that the rear oxygen sensor is mainly used to detect the threeYuanThe oxygen concentration of the exhaust gas after catalytic purification will be collected and fed back to the ECU for comparison, so as to determine whether the three-way catalyst is working normally. Then if the rear oxygen sensor fails, the ECU will naturally not receive some feedback signals. At this time, the OBD (engine exhaust system) fault light on the car dashboard will light up. You need to go to the auto repair shop or 4S in time. Shop for repairs.