Check Engine Light Due to Gas Cap Issue on Buick Park Avenue

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 114,166 (60,000–175,000)
7 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003
14 people reported this problem
4 people shared problem details
Car drove fine, but Service Engine light was on. Had it checked out and was told of a small air leak and gas caps loose their seal after a while. Got a new gas cap and the light went out.
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Fuel cap will not stay on.
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it's not fixed
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440 code showing as problem and after resetting/clearing code engine light always comes back on. Replaced fuel cap. Still coming on. Smoke tested car and replaced sensor...still comes on.
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