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International Automotive Technicians Network
Re: 2002 Yukon XL P0174, P0171
Posted to Technical Discussion Forum on 1/27/2006

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Hi jEEF,

That may be so in theory, however I have seen lean codes set at idle from an overfull fuel tank. The full tank did close the rollover valve, causing the unmetered air to enter the intake. I... Login to read more.