Illumination of the Check Engine Light may be the result of a loose or worn gas cap.
Problems for specific Chevrolet Cavalier years:
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Repairpal verified 2004 Chevrolet Cavalier problems
The serpentine belt tensioner can fail; it may become noisy and/or the belt may jump off. Replacement of the failed tensioner will be necessary.
The turn signal switch in the steering column may fail causing the turn signals not to work on one or both sides.
The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be replaced to correct this concern.
The fuel pump may fail causing the engine to stall and not restart.