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