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: 96,888 (108–175,000)
10 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005
20 people reported this problem
6 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.
check eng. light came on. cleaned rust off of fill pipe cleand cap reset light no prob
Fuel cap will not stay on.
it's not fixed
check engine light on replace MAF sensor to oxygen sensor gas cap and still have lights on now it's Code 440 but new gas cap put it on but still comes on once in awhile code 440 this is the second time it comes on after new gas cap put on
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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