P0421 Mazda

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OBD code P0421, 1999 Mazda Protege — Car Forums at Edmunds.com

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Mazda protege 2001 fix engine

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P0421 code: warm up catalyst efficiency below threshold (bank 1)

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P0421 mazda 8 (prob solve)

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The non-fouler trick to fix P0421, for noobs, by a noob | Mazdas247

Got code p0421

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