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Q: check engine light is on on 2006 Pontiac Montana

codes say gas cap is the problem, have replaced with both after market and original and still on.
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Please post the check engine code. This code should have given you a few choices besides gas cap such as evap. system small leak detected. Then you can try a visual inspection of the gas filler neck and charcoal cannister and surrounding connections. The only sure way is to get a smoke test done at a shop. Please post code though.
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