Po421

Author Nicola Beatty 25 Aug 2024

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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) - In

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P0421 my 2003 mazda protege5 needs a calcat (california catalyticI have a 06 mitsubishi endeavor that has an error code p0421. the Fugas evap ii (p0442 / p0445)P0421 code: warm up catalyst efficiency below threshold (bank 1).

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