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Originally Posted by SpdElemts
Yea my Nox Is high. The guy at the smog shop checked my EGR crap and he said its all in working order. Then he said it is probally my cat. My Nox Numbers were: 15mph max-704 meas-1502 25mph max-738 Meas-1786. Would a messed up cat cause that high Nox?
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how old is your cat?
they don't last all that long, and if you have a s13 with the factory cat, chances are pretty good that it's shot.
I've gone thru 2 s13s so far, and both have had used up cats