Code P0421

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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

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P0421 – warm up catalytic converter bank 1 efficiency below thresholdP0421 – warm up catalytic converter bank 1 efficiency below threshold Error code p0421?Fehlercode p0421 mitsubishi / i have a 02 lancer have code po421 the.

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