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The first time it was P0455 large evap leak, so I bought a new gas cap from Jeep, which seemed to fix the problem. Yesterday the check engine light came on again, I checked the code and it is a P0456 small evap leak, any ideas? Everything had been going good for some time, and the only other thing I did before the light came on was wash it yesterday. I do not know if washing it and it still being cold here would have anything to do with it? Thanks, Scooby
 

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make sure that its on tight, and be sure that the fill hose isn't lose or has any cracks cuts in it. That would be about the only things I could think of.
 

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check the vac lines of the manifold. my dad had that on his XJ, after replacing his cap i check the vac lines and sure enough one was hanging all by its lonesome
 
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