Funny because I booked my appointment for the same issue when this post came up. Same exact issue and I have 4100 miles on the car.
Update so far was they changed the fuel injector Tuesday and held onto the car and it would be ready today. 15 minutes after that, I get a 2nd call that they started up my car just now and the check engine light came back. They're guessing it's now the wiring harness...
At least I've had a nice new loaner (wanted to try the F30) but this 328 coupe gets alot of looks (white on oyster... chick car?)