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Failed NOx emissions - how to detect vaccuum leaks? O2 sensor? 200 1986

I saw that one cause of failed NOx can be exhaust leak before cat. conv., checked for that & didn't see/feel any leak.
I saw that vaccuum leaks can cause this problem, how do I detect them?
Can an old O2 sensor cause this?
Any suggestions, especially most likely causes is appreciated.






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New Failed NOx emissions - how to detect vaccuum leaks? O2 sensor? [200][1986]
posted by  Bonzo  on Mon Sep 29 07:13 CST 2008 >


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