While the MPT tune may not be causing a failure of anything and it just be a software bug, I'd be leary of just living with a check engine light because then how will you know if something else goes awry?
By no means am I implying Mike at MPT is doing anything wrong, but it somewhat bothers me that his first response is to say it isn't his tune. I would have expected he would request some datalogging to see if he can definitely rule out his software or tuning before making such a declaration. Hope you can get it straightened out since you seemed so pleased with MPT otherwise.
2013 V6 Base Coupe - Performance and Tech Packages - Ingot Silver
Bama Tuned with Airaid CAI - GT front brake upgrade - More to come.