Check Engine Light Due to Gas Cap Issue on Pontiac Sunfire

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

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Average mileage: 133,440 (30,000–332,345)
10 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005
30 people reported this problem
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problem details
2003 Pontiac Sunfire 128,000 mi,
check engine light on but says evap code
1997 Pontiac Sunfire 30,000 mi,
Purchased new gas cap.
2005 Pontiac Sunfire 332,345 mi,
got new cap
check engine light comes on, cause, fuel cap
2001 Pontiac Sunfire 81,435 mi,
check engine light on and replaced cap waiting to see the light go off hopefully soon
2003 Pontiac Sunfire 53,000 mi,
Engine light came on. Turned out the cause was the gas cap not being securely tightened. You have to hear clicks to be sure it's tight. My cap was very dirty. Cleaned it and it was fine but soon replaced it.
I can always tell when someone other than myself has messed with the gas tank lid....either its coiled up all wrong or i ge the check engine light...I then make sure during my next stop to undo the cap and retighten it, making sure it clicks at least 2-3 times. Usually, the check engine light will then go off after a couple of restars after the cap has been retightened.
My check engine light was on so i went to mechanic and it was diagnosed as it being the gas cap. replaced gas cap-problem solved! ;)