P0421 Mazda 3

31 Oct 2023

P0421 – warm up catalytic converter bank 1 efficiency below threshold What are catalytic converters? how do they reduce emissions? Mazda diesel

P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In

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Got engine code p0421 (catalyst efficiency below threshold bank 1

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P0421 on 2003 mazda protege 5, catalytic converter remove and install

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