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.

RepairPal Verified
Average mileage: 109,500 (60,000–175,000)
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
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.
Fuel cap will not stay on.
it's not fixed
Check engine light came on and I took the car to repair shop. Mechanic kept the car for one day and told me that he had identified the problem as an ill-fitting gas cap. He replaced the gas cap because he said that it was worn and not fitting tightly enough and he said that was causing the engine light to go on. That sounded like repair shop voodoo to my husband, but amazingly the new gas cap solved the problem.
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