1. Circuit fault: There may be poor contact or direct damage, whether the plug connection is tight, etc. Circuit fault may cause abnormal voltage detection and also cause the fault light to light up. When checking, you need to eliminate the circuit fault first. If the circuit fault is not eliminated, it will be costly to directly judge it as an oxygen sensor failure.
2. There is a problem with the gasoline added or there is too much carbon deposit in the engine, resulting in poor engine combustion, which may cause the fault light to light up.
3 The oxygen sensor fault light is on, indicating that the oxygen sensor is damaged, which will affect the normal operation of the engine. It is recommended to replace it in time. When the car's oxygen sensor is damaged, the combustion performance of the engine will be abnormal.