A4 (B6 Platform) Discussion Discussion forum for the B6 Audi A4 produced from 2002-2005

Cat or O2?

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Old 06-27-2013, 03:18 AM
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Default Cat or O2?

03 A4 3.0, P0421,P0431 are starting to rear there ugly faces at me. How do I determine the source of failure?

Also I am getting an intermittent min oil light. Comes and goes, but I am not leaking any oil.
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