Check engine light for emissions leak (again) - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 5 (permalink) Old 10-02-2009, 01:20 PM Thread Starter
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Check engine light for emissions leak (again)

This is the second time I've gotten a few gallons of gas just to tip it off and the check engine light comes on a day after.

After calling onstar it's the small emissions leak caused by the gas cap. I've made sure that the gas cap is tight every time I fill up.

My question is: Why does getting a smaller amount of gas than normal trip the emission sensor? This is annoying to say the least.

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post #2 of 5 (permalink) Old 10-02-2009, 06:41 PM
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It is the gas cap. Get a new one!
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post #3 of 5 (permalink) Old 10-03-2009, 03:55 PM
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From my understanding, and personal experience with the gas cap issue, it only runs the check at each quarter mark on the gas gauge. Quarter tank, half tank, etc. My gas cap CEL usually goes on after a quarter or half tank is used.
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post #4 of 5 (permalink) Old 10-03-2009, 06:40 PM
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replace the cap, a lot of the gto's had the same problem
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post #5 of 5 (permalink) Old 10-03-2009, 07:24 PM
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There is a TSB on that gas cap issue. Take it to the dealer, you will get a cap and a filler neck.

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