A "check engine" or "service engine soon" light can mean many various things, from a misfiring engine to a loose gas cap. Below are the five most common reasons a check engine light will be displayed:
1. Replace the Oxygen Sensor
An oxygen sensor monitors the unburned oxygen from the exhaust. The oxygen sensor monitors combusted fuel. A faulty sensor means it is not providing the right data to your car's computer and causes a decrease in gas mileage.
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