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Q:

twice in the past ,month I filled the gas tank and the check engine lite came on on 2004 Honda CR-V

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is there any corralation with a full gas tank and check engine lite coming on?
(1) Answer
Yes, it could have to do with a worn out fuel cap or a fuel cap that is not tight enough, or an issue with the fuel evap system or other things. Next tine it happens, have some one pull the code to see why the code is setting.