Chevy Code Po449

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I have 2007 Chevy Tahoeand I have a code PO449 EVAP Emission Control

Po449 code evaporative emission system vent control circuit intermittent

Z71 chevy 802b evapCode po449 radio works some times and change fuel cap a few days ago. P0455 chevy silverado trouble codePo449 code chevy tahoe.

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I have a 2008 chevy tahoe 5.3 liter four wheel drive. i have theI have a po449, po440, po131 any help would be great Code evap emission remove obd colorado wheelhouse liner gmc canyon refer left frontChevy traverse: p0496 evap code.