How to Determine if a Car Oxygen Sensor is Damaged?

1 Answers
DelCameron
07/30/25 4:43am
To determine if a car's oxygen sensor is damaged: A faulty oxygen sensor in a car will result in exhaust gases containing a high amount of oxygen after combustion of the air-fuel mixture in the cylinders. A high oxygen content indicates a lean mixture, while a low oxygen content indicates a rich mixture. The oxygen sensor is an essential component for the engine to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the theoretical value, the oxygen sensor detects the oxygen concentration in the exhaust and controls the fuel injection amount through feedback, thereby maintaining the air-fuel ratio within the normal range. The core component of the oxygen sensor is a porous ZrO2 ceramic tube, where high-concentration oxygen molecules inside the tube can be adsorbed to form electrons, creating a potential difference.
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