Chevy Code Po449

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Evap code po449, 161800 miles, i just replaced the evap canister and

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Chevy silverado code p0455

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Code po449: i changed the vent solenoid,and erased the code and it...Code evap emission remove obd colorado wheelhouse liner gmc canyon refer left front Po449 code evaporative emission system vent control circuit intermittentI have a po449, po440, po131 any help would be great.

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Evaporative Emission System Vent Circuit

P0455 chevy silverado trouble code

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