P0421 Code Mazda 3

16 Jan 2024
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Larue Renner DDS

P0421 – warm up catalytic converter bank 1 efficiency below threshold P0421 code meaning, symptoms, causes & fixing What are catalytic converters? how do they reduce emissions?

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Code problem mazda threshold bank belowMazda 3 p0421 code: meaning, causes, how to fix Obd code p0421, 1999 mazda protege — car forums at edmunds.comP0421 code: warm up catalyst efficiency below threshold (bank 1).