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

Yes, that code almost always means the vehicle needs a new catalytic converter, but it's a good idea to just check some things out first. And if a problem was found, then you would want to fix it, so the converter isn't ruined again.

What about an exhaust le... Login to read more.