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Hey Axeman I got the code its P0442 the mechanic said its a EUAP small leak detect so he earased the code wich turned off the check engine light he said if i put gas in my jeep while its started that could have caused the light to go on because it take between 1 and 3 pounds of pressure in my tank or the gas cap but it looks fine what do you think about all this
 

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P0440 or P0442 trouble codes can usually be traced to a leaking fuel cap. If the cap does not have an airtight seal it can result in these nusiance check engine lights.

Get a new fuel cap. It should fix it. And make sure the cap is completely sealed when refueling. One or two "clicks".
 
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