Question about 2005 GMC Sierra

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Engine light on my 2005 gmc 1/2 ton pickup came on.

Code po 449 came up on the computer check,any ideal's?

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I got code PO 452, PO 443, PO 449 all EMS codes what do I need to replace and how hard to do your self?


The codes only tell the mechanic what to test, not what to replace.
You would need to get the shop manual for your vehicle to have the test instructions for each code.
Code 452 is a problem with the fuel tank pressure sensor circuit, 443 is evap canister purge and 449 is the vent valve circuit.
The evap system and those components would need to be checked out.

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