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International Automotive Technicians Network
Re: GM dealer says P0420 caused by downstream sensor. What say you?
Posted to Technical Discussion Forum on 3/12/2007

Hi Robert,

Thanks for the reply. You pretty much nailed my sentiments on the issue. I admit that I only spent a few minutes looking at the car. At that time the front and rear sensors were doing their thing...no fuel trim issues etc. I was more than willing ... Login to read more.