Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific Cadillac DeVille years:
Car problem reports
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Most reported 2002 Cadillac DeVille problems
The steering wheel position sensor may fail, resulting in the service stability message being displayed.
One or both transmission output shaft seals may leak. Our technicians tell us that worn bushings inside the transmission could be the cause of the damaged seals. Our technicians tell us that if a bushing is worn, excess play will be noted where the drive axle attaches to the transmission.
The alternator may fail causing the battery to go dead, or an abnormal noise may develop. The dash warning light may or may not illuminate. A failed alternator will require replacement.