Check Engine Light Due to Gas Cap Issue on Chevrolet 1500 Pickup

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

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Average mileage: 127,850 (67,500–188,200)
Exhaust & Emissions affected: Gasoline
4 model years affected: 1996, 1997, 1998, 1999
6 people reported this problem
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1996 Chevrolet 1500 Pickup 188,200 mi,
Check engine light was on and had a code 420 or 430 can't remember but a new cat. conv. fixed it