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International Automotive Technicians Network
Re: 2002 Yukon XL P0174, P0171
Posted to Technical Discussion Forum on 1/26/2006

I'm not sure what the TSB mentioned is, however I would like to also see the MAP and MAF at Idle Baro. Indication is there is not vacuum leak and and idle fuel calculation issue. The calculation error at idle could be a possible incorrect MAP reading. I would ... Login to read more.