Audi Code P0421

06 Nov 2023

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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

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P0421 code

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P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In

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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

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

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