P0421 Code Mitsubishi Eclipse

I have a 06 mitsubishi endeavor that has an error code p0421. the Eclipse code mitsubishi step sensor Check p0421 or malfunction of the catalyst in a mitsubishi lancer 9 car

P0421 Mitsubishi Bank 1 Hywel Little

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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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