P0421 Code
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P0421 code on Mitsubishi Outlander Sport 2015 : r/Cartalk
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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold
P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In
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P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts
P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts