Code P0421

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P0421 – warm up catalytic converter bank 1 efficiency below threshold

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Code P0421 Catalytic Converter: My Car Had 2 P0421 Codes, Page 3

Check engine light on with code p0421, how do i fix it?

Check engine light on with code p0421, how do i fix it?P0421 — warm up catalyst efficiency below threshold (bank 1) – eeuroparts Mitsu anything call code before do lancer evolutionm mitsubishiP0421 code: warm up catalyst efficiency below threshold (bank 1).

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Code P0421?: I'm Getting That Code, but I Do Know That the...

P0421 – warm up catalytic converter bank 1 efficiency below threshold

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Code p0421?: i'm getting that code, but i do know that the...Code p0421?: i'm getting that code, but i do know that the... P0421 – warm up catalytic converter bank 1 efficiency below thresholdEngine running rough p0421 code. 04 endeavor. just had orielys run code.