Well I'm at 15,000 miles now and my CEL comes on more than my high beams, every time I make an apt to drop off the darn light goes out, for a while. I bought a code reader last night and got the code P11D7, which I've had before. I have searched and I believe this is a NOX sensor issue, if anyone knows for sure please chime in on this. Looks like it will be going back to the dealer next week, ugh! I hope your right on the in stock inventory on the NOX sensor, and what the heck is this BS of "part restriction" from GM? The dealers should HAVE IN STOCK parts for the cars they are selling period! Or don't sell your cars to people put you cars on "selling restriction" until you have parts.