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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
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
Viewing 1 - 1 of 1 problem details
Check engine light was on and had a code 420 or 430 can't remember but a new cat. conv. fixed it