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Reverend Red Bull
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The above suggestions are worthwhile on making sure the 2nd Recall (and not the 1st) is complete on the NOX1 sensor, since the 1st recall was known to cause codes from NOX2.

Another place to look will be for a clogged DEF injector. There have been occasions in the past where a clogged DEF injector caused inadequate reduction of NOX, but the system mis-interpreted it as a failure of the NOX2 sensor instead, since there is no mechanism for monitoring the actual DEF injection quantity/quality other than how much NOX reduction has occurred at NOX2.

Another thing to investigate is whether they servicing dealers have opened a case with GM-TAC (General Motors Technical Assistance Center). We learned about this because when the CTD was originally released, consulting them was required for all CTD emissions repairs. That restriction has since been lifted, but contacting TAC can still be beneficial, since most dealers only have experience with a handful of Cruze Diesels, but the TAC has a database of problems and resolutions on Cruze Diesels nationwide and accompanying procedures to accurately diagnose the problem rather than just throwing parts at it.
 
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