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Mazda DTC P0421
Posted to Technical Discussion Forum on 4/12/1999 2 Replies

Hello group,

I have this Mazda in the shop today with the MIL on and this DTC P0421 stored. The Snap-On scanner defines this code as "warm up cat efficiency bank #1". That is all the info I can find on this code. I have uploaded the FF data, although I don't... Login to read more.

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