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

I don't think so, based on the pictures. It's more likely that the cat has just gone bad after that many miles.

If the tail pipe were squashed almost all the way closed (more than what is in your pictures), then the exhaust could not escapse easily, so it wo... Login to read more.