Code P0421

11 Nov 2024

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[solved] p0421 code: fixing warm up catalyst efficiency below threshold Code p0421 catalytic converter: my car had 2 p0421 codes stored Error p0421

P0421 – warm up catalytic converter bank 1 efficiency below threshold

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Causes and fixes p0421 code: warm up catalyst efficiency below

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[SOLVED] P0421 Code: Fixing Warm Up Catalyst Efficiency Below Threshold

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