So after many years of trouble-free motoring and a quick trip to TN, my X3 has stumbled across the same problem. After filling up in TN and driving 4 hours home, I've been noticing a slight irratic idle, occasional "squeaks" coming from the engine bay from the vicinity of all the DISA valve/intake boot area. On my way to Autozone to pull some error codes, the SES light illuminated, how timely. Same two codes as above. No drivability changes although the squeaking can be heard while driving sometimes. I visually checked what I could see of the intake snorkel but didn't see anything obvious.
I don't have the tools, space, or technical skills/knowhow to start taking apart stuff in my apartment complex, so I guess it's off cross-town to the BMW indy shop.