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 Diagnosing Your Check Engine Light Before Heading to the Mechanic   Automotive,Research,Self Improvement Oh no, your check engine light just came on! When the check engine light comes on, most always, we start to panic in fear that our car is going to shut off right then and there or worry over the thought of how much money it may cost. But no matter what, when a check engine light comes on, it means that there is most definitely something wrong under the hood. Here are the most common issues associated with a check engine light in Davis County. Oxygen Sensor: An oxygen sensor measures the unburned oxygen in your vehicle's exhaust system. The data of which it presents sends information for the regulation of the mixture of air and fuel that enters the cylinders. A bad oxygen sensor can damage spark plugs, the catalytic converter, and burn more fuel. Loose Gas Ca p: If the gas cap is loose or missing, the check engine light will turn on. It is very important to make sure your g...