Code P0421
P0421 – warm up catalytic converter bank 1 efficiency below threshold Code p0421 catalytic converter: my car had 2 p0421 codes, page 3 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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[SOLVED] P0421 Code: Fixing Warm Up Catalyst Efficiency Below Threshold

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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

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