Did you ever find out what the cause of the codes was? I ask because Friday afternoon I got the old "Increased Emissions" at 4:40pm. Called the dealer to see if they could just read to code and tell me if it was safe for this past weekend's "road trip" and they told me no, but they said as long as the Service Engine light was yellow, it was fine (which mine is). So I drove it like I stole it all weekend and never had any mechanical issues.
Weird thing was, no error Saturday. But it popped back up Sunday. I already have an appt for Weds, just curious what your failure was due to and if mine is the same.
Edited to add: I know it's NOT because the gas cap is loose....
Just a girl and her 863 ponies...
2013 Santorini M3
2016 328i Alpine White Wagon (Lab hauler)
199x Sapphire M3 (because racecar)