Check Engine Light Due to Gas Cap Issue on Buick Riviera

A Loose or worn gas cap may cause Check Engine Light to illuminate.

RepairPal Verified
Average mileage: 92,908 (59,817–126,000)
3 model years affected: 1996, 1998, 1999
5 people reported this problem
2 people shared problem details
1998 Buick Riviera126,000
check engine light came on, loss of power from motor, i thought it was the supercharger going out. Ended up being a bad gas cap.
1998 Buick Riviera59,817
I was told the charcoal canistor is pluged or needs to be cleaned or replaced.
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