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What are the top 5 reasons that a check engine light will come on for a 1999 Chevy Malibu?

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I am not sure of the other 4 reasons But in my experience the top reason your check engine light comes on is because your gas cap isnt tightened all the way.

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First answer by ID0404761494. Last edit by ID0404761494. Question popularity: 14 [recommend question]

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