Strange Boost Issue E84 N20 XDrive28
I have been driving a 2014 E84 X1 XDrive28 for five months now. Everything seemed normal for the first four months.
I recently had the oil changed by my local dealership. I have a strange issue since that service.
The max boost I am seeing now is quite low (8-10psi as measured by a bluetooth OBDII) in normal drive and sport modes under hard acceleration.
The odd thing is that it is much better in Eco Mode. The OBDII registers 15+psi under hard acceleration in that setting. The difference in performance is dramatic.
Anyone have any idea what the problem could be?
ETA: I have reset the ECU with no change.