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How to Determine if the Oxygen Sensor is Faulty?

1 Answers

MacSpencer

07/30/25 9:37am

Methods to determine if the oxygen sensor is faulty: Observe the color of the oxygen sensor's exterior. The normal color is light gray. If it appears white or brown, it indicates the oxygen sensor is faulty. Introduction to oxygen sensors: 1. 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 located behind it. 2. The front oxygen sensor is used to adjust the mixture concentration. 3. The rear oxygen sensor's task is to monitor the working condition of the three-way catalytic converter. Consequences of oxygen sensor failure: 1. Front oxygen sensor failure will prevent the mixture from being corrected, leading to phenomena such as decreased car power. 2. Rear oxygen sensor failure means it is impossible to determine the operating condition of the three-way catalytic converter. Once the three-way catalytic converter fails, it cannot be repaired.

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