Car Problem Reports

Pontiac Sunfire Check Engine Light Due to Gas Cap Issue

Pontiac Sunfire Problem
23 Reports
Me Too

Model Years Affected: 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

Average Mileage: 108,738 mi (30,000 mi - 205,000 mi)


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

  • Visitor, , 128,000 mi

    check engine light on but says evap code

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  • Visitor, , 81,435 mi

    check engine light on and replaced cap waiting to see the light go off hopefully soon

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  • Visitor, , 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.

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  •  Rookie

    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.

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  •  Rookie

    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! ;)

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  • Visitor, , 30,000 mi

    Purchased new gas cap.

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