P0421 Mazda

21 Feb 2024

Catalytic converters emissions converter P0421 on 2003 mazda protege 5, catalytic converter remove and install Muffler automotive carparts cons pros

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Need help with codes p1487 and p0421 for mazda 6 2004.

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Mazda 6 P0421 Code: Meaning, Causes, How to Fix | Drivetrain Resource

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P0421 warm up catalyst efficiency below threshold (bank 1) #

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