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2009 GMC Sierra 2500 HD WT 6.0L MIL Lamp on VIN: 1GTHK43K59
This truck came from another garage and the complaint is that the cel is on but the truck is running fine.the tune up was done spark plug wire mass air flow air filter were replaced.i begin by checking the stft and ltft and they were at stft -15 and ltft -... Trouble codes: P0172, P0175
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