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Oxygen (O2) Sensors
Oxygen sensors play a big part in keeping your engine running at peak performance. If you think your oxygen sensor is malfunctioning, there are a few factors to look into. One of the main symptoms of a faulty oxygen sensor symptom is a 15% decrease in mileage and that can really add up in your cost at the gas pump. An oxygen sensor can malfunction anywhere from 30,000 to 100,000 miles depending on type and vehicle.