Question about 2002 Chevrolet Avalanche

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When i open my gas cover i hear air coming out.

My check engine light is on and when i open my gas cover i hear air,would that make the light come on or is it a sensor that i need?If it is a sensor where would it be located on the truck,and do they cost much?Thanks for your help...clayton.

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I had a similar problem with a Grand Am one time. My check engine light would come on until I removed the gas cap and replaced it, after a couple minutes driving the light would come back on. My problem was a faulty gas cap. I would suggest taking it to the auto parts store and having them check the error code for you. Most will do this for free and point you in the right direction.

Posted on Sep 10, 2009


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A second cause could be a problem with the ground wire that comes from the gas cap sensor and goes to the body. Look up into the wheel well by the filler pipe to check.

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If you allready checked the gas cap and its on right.
Try replacing the gas cap with a new one.
You should here air wen you open the gas cap after driving
This is part of the emision controls and if it dosn't seal it will cause the check engine light to come on .

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