How often should an oxygen sensor be replaced?
1 Answers
Oxygen sensors do not have a fixed replacement interval, but it is recommended to replace them for vehicles with over 100,000 kilometers. There are usually two oxygen sensors: the one located in front of the three-way catalytic converter is called the front oxygen sensor, while the rear one is positioned behind it. The front oxygen sensor is used to adjust the mixture concentration, and the rear oxygen sensor monitors the working condition of the three-way catalytic converter. Sensor poisoning is a common and difficult-to-prevent malfunction, especially for vehicles that frequently use leaded gasoline. If the poisoning is mild, cleaning can restore normal operation. However, if lead penetrates the interior and obstructs the diffusion of oxygen ions, rendering the oxygen sensor ineffective, replacement becomes the only option.