P0421 Audi

Author Walker McCullough 22 Nov 2023

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2003 Audi A4 3.0L issues. CEL. P0421 w/ engine symptoms. Time for new

P0421 code P0421 code audi a4 2002, 2.0 fsi 2003 audi a4 3.0l issues. cel. p0421 w/ engine symptoms. time for new

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P0421 Code Meaning, Symptoms, Causes & Fixing

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

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