Does the Oxygen Sensor Need Regular Replacement?

[GrahamRose]

Oxygen sensors do not require regular replacement. Under normal circumstances, as long as the vehicle is properly maintained and not subjected to aggressive driving, the oxygen sensors can last up to 100,000 kilometers without issues. Typically, there are two oxygen sensors: the front oxygen sensor and the rear oxygen sensor. The front oxygen sensor is located before the catalytic converter and is used to adjust the air-fuel mixture concentration. The rear oxygen sensor is positioned after the catalytic converter and monitors its working condition. The oxygen sensor in a car is a feedback sensor in the fuel injection engine control system. Its function is to detect the oxygen concentration in the exhaust and send feedback signals to the ECU, which then adjusts the fuel injection quantity to maintain the air-fuel ratio near the theoretical value. Common faults of oxygen sensors include: 1. Oxygen sensor poisoning, usually caused by using leaded gasoline; 2. Internal wiring breakage; 3. Heater resistance wire burnout; 4. Ceramic cracking of the oxygen sensor.