Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific Buick Park Avenue years:
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Most reported 1999 Buick Park Avenue problems
When replacing the battery I accidently touched my wrench from the positive terminal to bare metal which caused my fuel gauge needle to go completely around to the stop pin. Had to use the trip mileage for the last 5 years to gage when to fill the tank. Found out on this site that a magnet placed against the plastic directly in front of the needle and rotating it counterclockwise would put the needle back in position. Did this and now works fi...