Question about 2004 Jeep Wrangler

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Check engine light code PO456

My check engine light went on in my 2004 jeep wrangler, I looked up the code, PO456, it said very small leak has been detected in the evaporative system. I changed the gas cap and the light still came on. This has been a problem for a while, it goes away for a while and then it comes back on a few days or even weeks later.............help

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  • hp5230 Feb 27, 2009

    can you tell me if it is a big job to fix?

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Most likely the pressure sensor in the fuel tank for the evap system is defective.

Posted on Feb 26, 2009

  • yadayada
    yadayada Feb 27, 2009

    On a car lift no big deal, on the ground it can be difficult, the sensor is on the top of the tank in a rubber grommet, it is about the diameter of a tube of tooth paste with of course a wiring connector on it.

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