Code P0421

P0421 – warm up catalytic converter bank 1 efficiency below threshold Check engine light on with code p0421, how do i fix it? Decoding the p0421 code: troubleshooting mitsubishi outlander's

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 code, how to fix? | Mitsubishi Eclipse 3G Club

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P0421 — warm up catalyst efficiency below threshold (bank 1) – eeuroparts

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Error code p0421?Causes and fixes p0421 code: warm up catalyst efficiency below P0421 – warm up catalytic converter bank 1 efficiency below threshold.