Question about 2005 Chevrolet Monte Carlo

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My check engine light keeps coming on. i got a new gas cap put i didnt get it from a xhevy dealership. it was off for about a aweek. now its back on.

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  • Chevrolet Master
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What was the code, The clamp to the filler tube may have corroded and broke casing a slow leak. You mentioned that you replaced the gas cap other then a OEM, that's where you may be getting your problem. The EVAP system is unique for every brand of vehicle and a after market gas cap is generic and will cover a wide range of cars just to fit but may not conform to your EVAP system. You can always bring it back and ask for another one just to make sure the new gas cap is not faulty too since there generic and not made specific to your car's EVAP> Good luck and hope this helps. 

Posted on Jun 24, 2009

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  • Master
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Most likely an IMPROPER GAS CAP. Spend the add'l money and go to CHEVY. Hope this helps

Posted on Jun 24, 2009

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Posted on Jan 02, 2017

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