Code P0421
P0421 – warm up catalytic converter bank 1 efficiency below threshold Code p0421 catalytic converter: my car had 2 p0421 codes, page 2 Code p0421 catalytic converter: my car had 2 p0421 codes, page 2
P0421 Code Meaning, Symptoms, Causes & Fixing
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Causes and fixes p0421 code: warm up catalyst efficiency below .
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