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<font face="Verdana, Arial" size="2">Originally posted by dart64:
I just failed my emmissions test. They said my Nox was too high. I don't know what that means, but does anyone know what I should do?

The guy told me it may be my catylic converter, but I read on a post somewhere that if your converter was bad, it would smell like rotten eggs. My car doesn't smell.

Also, I read that the EGR valve could be the problem. I do have that surge hesitation thing under 3000 rpm, so maybe that could be it? I know you can clean it, but I'm so clueless when it comes to working on cars.

The car passed emissions in New Jersey, I don't understand why it wouldn't pass in California.

Any advice would be great.

My cat was bad when I did an emissions test a couple years ago. I had the high Nox level, too. The car appeared to run fine and didn't have a "rotten egg" smell. However, when they replaced the cat, I took a look at the old cat, and a huge chunk of the honeycomb inside had broken loose.

'93 Sentra SE-R, daily driver and track/autox toy
'91 Sentra SE-R, future racecar
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