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I've had high NO a 2 times on 2 different cars. Failed on the 15 and passed on 25 just like you. It's something in the EGR system. In both cases, there was a crack in the hose at the EGR valve. I know it's a PITA, but you really need to give those hoses the most anal check you've ever done. The fist time it happened to me, I did everything you're doing and swore I checked the hoses at least 5 times. We even used some brake clean to see if the there was a change in idle. Well, the crack in the hose was in a blind area and wan't getting hit by the brake clean from the angle we were spraying. So.... my advise it take each hose connected to the EGR and disconnect the ends, inspect it, and then reconnect them. I did that the 2nd time it happened to me and found the crack right away and passed when i brought it back. Good luck man.
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And that's my 2 cents...
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