What are the symptoms of a faulty car oxygen sensor?

1 Answers
Julian
07/30/25 10:07am
When a car's oxygen sensor fails, it can lead to a noticeable increase in fuel consumption. The emission of pollutants will also rise, potentially causing the vehicle to fail its annual inspection. Additionally, the engine may experience unstable idling, shaking, misfires, or surging. As a critical component of the electronic fuel injection system, the oxygen sensor plays a vital role in ensuring the engine's proper operation and effective control of exhaust emissions. Detailed symptoms of a faulty car oxygen sensor: A significant increase in fuel consumption occurs when the oxygen sensor is damaged. Carbon buildup on the sensor can cause abnormal signal output, leading to an imbalance in the engine's air-fuel mixture and higher fuel consumption. The oxygen sensor should be cleaned. Increased pollutant emissions may result in a failed annual inspection due to excessive exhaust emissions. A damaged oxygen sensor can cause incomplete combustion in the engine, leading to higher pollutant emissions. The sensor should be cleaned or replaced. Engine issues such as unstable idling, shaking, misfires, or surging can also be caused by an abnormal air-fuel ratio. The air-fuel ratio should be checked.
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