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International Automotive Technicians Network
Re: P0420 Code - 2nd Aftermarket Converter - OE not available
Posted to Technical Discussion Forum on 10/18/2018

Hi Scott,

If you are using a 48 state converter that may be all thats wrong. However as others have mentioned, there could be something shortening your converter life. Is vehicle in fuel control? Whats lambda? Is it burning oil? If everything is okay, I reco... Login to read more.