P0421 Engine Code

Author Prof. Haylie Feest 01 Oct 2023

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Po153 Engine Code

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What is p0421 engine code [quick guide]

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What causes check engine light to come on and return code P0421?

Check engine light p0421 code

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

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P0420 & p0421 trouble codes

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