Your Gas Cap is Loose. When you start your vehicle, it runs an evaporative test on the fuel system.If there is a leak detected, it will turn on your ses/check engine light. Thefirst thing you want to check is that your gas cap is on tight. If that was theproblem, your light should turn off after a few engine cycles.(every time you start your car is an engine cycle) Bad Spark Plugs When your spark plugs wear out, your vehicle will start to missfire. This willcause your ses/check engine light t...
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