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Re: Catalyst Monitor - P0420 Catalyst Efficiency below threshold.
Posted to Technical Discussion Forum on 8/27/2001 1 Reply

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Very good observation. I just looked and a P0420 is for manual trans and a P0421 is for automatic. I have not run accross a P0420 on this engine family so I wrongly assumed that Scott posted the incor... Login to read more.

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