Code P0421
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P0421 code: warm up catalyst efficiency below threshold (bank 1)
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Code P0421 Catalytic Converter: My Car Had 2 P0421 Codes, Page 3

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

P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

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