Code P0421

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Causes and Fixes P0421 Code: Warm Up Catalyst Efficiency Below

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P0421 code: warm up catalyst efficiency below threshold (bank 1)

P0421 – warm up catalytic converter bank 1 efficiency below thresholdI have a 06 mitsubishi endeavor that has an error code p0421. the Engine running rough p0421 code. 04 endeavor. just had orielys run codeCauses and fixes p0421 code: warm up catalyst efficiency below.

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Causes and Fixes P0421 Code: Warm Up Catalyst Efficiency Below

Code p0421?: i'm getting that code, but i do know that the...

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