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International Automotive Technicians Network
Re: Hummer P0171 - Check everything
Posted to Technical Tips Forum on 3/29/2018

Whenever I get a o2 code with an exhaust leak, I try to tempera illy fix the leak (wet rag sometimes works) and see if the trim changes. Not sure if you can do that with a cracked manifold. It amazes me how sometimes a small leak will have a large impact on f... Login to read more.