I just failed a smog check for high NO (Nitrogen Oxide) emissions on my 03. I did some reading and found that a faulty EGR valve is a common cause. I have a copy of the downloaded shop manual, but I cannot find a reference to the EGR valve that tells me where it is located. Can anyone tell me which page its on or where to look under the hood?

 

350Z's don't have EGR valves...

 

Sounds like your cats are going...