Check Engine Light Due to Gas Cap Issue on Pontiac Bonneville

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 118,457 (112,372–125,000)
5 model years affected: 1996, 2001, 2002, 2004, more2005
6 people reported this problem
1 person shared problem details
For as long as I can remember the check engine light is on. Replaced the gas cap. Works for about a week. Light back on. I gave up
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