Cat or O2?
#1
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.
Also I am getting an intermittent min oil light. Comes and goes, but I am not leaking any oil.
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