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High NOx is a sure sign of a tired cat. No matter where you take it, that's the first thing they would replace.
I just had my Chrysler LHS smogged and it did pass. However, the NOx was a getting up there, so the first thing the tech mentioned was my cat was getting tired.
Cheers,
Joe
Last edited by stlrj; 12-05-2009 at 10:10 AM..
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