Mazda & ford code p0421 (easy fix) P0421 on 2003 mazda protege 5, catalytic converter remove and install Sensor o2 mazda mazda6club
P0421 | Mazda 6 Forums
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P0421 my 2003 mazda protege5 needs a calcat (california catalytic
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P0421 code: warm up catalyst efficiency below threshold (bank 1)
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Got code p0421
P0421 warm up catalyst efficiency below threshold (bank 1) #Obd code p0421, 1999 mazda protege — car forums at edmunds.com Отломился фланец глушака, вот наверное причина ошибки p0421 — mazda 323.
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