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2003 Audi A4 Quattro Question: cel with p0421 and 431...how can i troubleshoot and determine the root cause

 

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rajy, 3.0L V6, Champlain, NY, February 15, 2012, 12:52
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Car passed emmision test last week...Would like to determine the root cause before repairing...don't want to just replace the cats and the o2 sensors...Where can i get an accurate diagnosis?

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