Code P0421

Check engine light on with code p0421, how do i fix it? P0421 code: warm up catalyst efficiency below threshold (bank 1) P0421 — warm up catalyst efficiency below threshold (bank 1) – eeuroparts

Check Engine Light on with Code P0421, How Do I Fix It?

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

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Code p0421- call mitsu before you do anything!Causes and fixes p0421 code: warm up catalyst efficiency below P0421 – warm up catalytic converter bank 1 efficiency below thresholdP0421 code meaning, symptoms, causes & fixing.

Code p0421 catalytic converter: my car had 2 p0421 codes, page 2

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P0421 code

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