P0421 – warm up catalytic converter bank 1 efficiency below threshold Engine running rough p0421 code. 04 endeavor. just had orielys run code P0421 code, how to fix?
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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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P0421 — warm up catalyst efficiency below threshold (bank 1) – eeuroparts
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