Code P0421

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Causes and fixes p0421 code: warm up catalyst efficiency below

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

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Code P0421 Catalytic Converter: My Car Had 2 P0421 Codes Stored

P0421 – warm up catalytic converter bank 1 efficiency below threshold

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Causes and Fixes P0421 Code: Warm Up Catalyst Efficiency Below

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