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International Automotive Technicians Network
Re: 2002 Yukon XL P0174, P0171
Posted to Technical Discussion Forum on 1/26/2006 4 Replies

Hi Matt,

With the vehicle at idle, I would stick the gas analyzer in and see if we are at Lambda 1. If so, I would start by smoking the intake for leaks. If it were lower than 1, I would start by smoking the exhaust for leaks.

Jamie Login to read more.

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