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What Are Symptoms of a Bad Oxygen Sensor?

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A bad oxygen sensor can negatively impact an engine’s performance in a variety of ways. Because of the important role an oxygen sensor plays in the maintenance of proper air and fuel levels in a running engine, any abnormal or faulty oxygen sensor function can create several abnormal engine symptoms.

Poor Gas Mileage

Oxygen sensors play a huge role in adjusting a vehicle engine’s air/fuel ratio, the combination of gas and air an engine burns to produce power. A faulty oxygen sensor may allow too much fuel to be added to the air/fuel ratio, resulting in poor gas mileage.