Question about 2000 Jeep Grand Cherokee

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PO422 AND PO455 CODE KEEP COMINGN UP ON CODE READER

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  • hjimenez Dec 28, 2008

    My "engine" light came on and the people at Pep Boys diagnosed it as:
    PO455-EVAP Sys large leak and
    PO442-EVAP small leak.

    What does it mean and how do I fix it?
    Thanks,
    H.
    hjimenez@optimum.net

  • Anonymous Jan 08, 2009

    Same thing on my 2002 Grand Cherokee.They keep saying gas cap but the problem persists.

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Save your self the headache the problem is your gas cap there is a o-ring that wears out and when the system runs a emissions test by a little pump which pulls vaccum and the system and a little leak is the cap most times a gas cap is under 20.00 try that first.

Posted on Jan 10, 2009

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Best bet would be to have it smoke tested. about a half hour labor at most shops

Posted on Jan 10, 2009

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1 Answer

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