Check Engine Light Due to Gas Cap Issue on Buick Riviera

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

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Average mileage: 111,939 (59,817–150,000)
3 model years affected: 1996, 1998, 1999
6 people reported this problem
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problem details
1998 Buick Riviera 126,000 mi,
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 Riviera 59,817 mi,
I was told the charcoal canistor is pluged or needs to be cleaned or replaced.