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International Automotive Technicians Network
Re: Will this cause a P0420?
Posted to Technical Discussion Forum on 5/4/2010

I think it depends on how much for how long the problem has been around. I see this vehicle on a regular basis, and it is on the road, long trip driven. It was parked in the Seattle area for the winter. Last week, it was driven from the Seattle area over to ea... Login to read more.