Code P0421

P0421 code: warm up catalyst efficiency below threshold (bank 1) Code p0421 catalytic converter: my car had 2 p0421 codes, page 2 O2 bucks error wiping

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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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

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