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Then it is obvious the gas cap was not the problem. You need to have the codes read and see what code you are getting. Use that code to help diagnosis the problem.

My 1999 deville has the same problem.but i know i need a new fuel filler neck(wondering if that could be the problem)?

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Q: 1999 deville check gas cap and service engine light onWhen I erase the codes a week later it is on again.?
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