I have a 94 jdm h22 with a dc header and a USDM p13 high flow cat. I have 92 cdm vx .
so i went to get my bar sticker and i go to do the sniffer and well look. i passed HC's and CO's but NOX is another STORY
MAX GP MEAS
807 2014 2667 15MPH
746 1814 1024 25MPH

My egr must not be lifting to let exhaust in I think. i need help.
IS THERE A SHOP OR PERSON HERE THAT I CAN PAY TO HELP.

 

Man....i have no idea. I'm sure there's someone here that can help, but I would personally think thats the problem.

 

HC's 15mph-190 25mph-73 /
CO's 15mph-0.63 25mph-0.23 /
o2's 15mph-.05 25mph-0.1
co2- 15mph-14.0 25mph-14.6

these are my results