Code P0421

Mr. Ulices Schuster IV 17 Oct 2023

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P0421 code: warm up catalyst efficiency below threshold (bank 1) Code p0421 catalytic converter: my car had 2 p0421 codes, page 3 O2 bucks error wiping

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Error p0421

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P0421 – warm up catalytic converter bank 1 efficiency below threshold

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