Chevy Code Po449

I have a 2008 chevy tahoe 5.3 liter four wheel drive. i have the Z71 chevy 802b evap Evap canister 05 silverado

Evaporative Emission System Vent Circuit

P0455 code chevy for "evap system small leak detected"

I have 2007 chevy tahoeand i have a code po449 evap emission control

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Evaporative emission system vent circuit

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2003 Astro Code PO449 emission vent malf | Chevy Astro and GMC Safari Forum

Code po449 radio works some times and change fuel cap a few days ago.

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