A groaning type noise may be noted from the front suspension when driving over speed bumps or pot holes. Our technicians tell us that revised sway bar bushings are available which should correct this concern.Google+
Car Problem Reports
BMW 128i Groaning noise from front suspension
BMW 128i Problem
Visitor, 2010 BMW 128i, 40,000 mi
This happened in my car in May 2014.
If the car accelerated past 15 miles an hour, there'd be a groaning side from beneath either side of the car.
The dealer fixed it and told me it was bushings that had become loose.