Code P0421 Mazda 3

P0421 code: warm up catalyst efficiency below threshold (bank 1) Catalytic converters scr emissions reduce needed P0421 – warm up catalytic converter bank 1 efficiency below threshold

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P0421 – warm up catalytic converter bank 1 efficiency below threshold

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

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Got engine code p0421 (catalyst efficiency below threshold bank 1

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