Defect
On certain vehicles, the variable camshaft timing (VANOS) adjustment unit housing bolts could loosen or break. As a result, the camshaft could become incorrectly adjusted and cause the engine to enter a reduced power mode (limp mode) or to stall while driving.
Safety Risk
A sudden loss of engine power could increase the risk of a crash.
Remedy
BMW will notify owners by mail and advise you to take your vehicle to a dealership to replace the VANOS bolts.