How Do I Fix Code P0421

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P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

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Check engine light on with code p0421, how do i fix it?

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P0420 & P0421 Trouble Codes - Diagnosis, Causes, Symptoms & How to Fix

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

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