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How to clear a P0455 code on a '05 Chevy Equinox?

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I have replaced the gas cap, and purge solenoid (twice) and have not found any leaks in the hoses.  What else could be throwing this code?  I cannot get it through emissions testing to get my registration current....
Vehicle: 2005 Chevy Equinox

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Have you checked the condition of the pistons? Could be a bad vacuum from the induction stroke.

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