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2008 GMC Acadia Question: Check engine light comes on. I have had it scanned and code P0455, P0449 appear

 

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djmcafee, Hallettsville, TX, February 18, 2012, 11:02
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I repalced the gas cap form NAPA cleared the light but after one day, the light came back on. Any idea what to look for and where the bad components are?

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