Question about 2003 GMC Envoy

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Engine code po442 - 2003 GMC Envoy

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Check your gas cap, make sure it's tight or replace it. If after a new cap your light is still on, you should have a smoke test done on the EVAP system to find the leak. Filler neck's tend to crack, very hard to diagnose without a smoke test.

Posted on Apr 16, 2014

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Posted on Jan 02, 2017

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