Necessary preliminary tasks:
Release screws (1) and remove engine mount (2).
Installation note: Rubber buffer (1) on engine mount must point towards center of vehicle.
BMW X3 Service & Repair Manual > Alternator with drive and mounting: Removing and installing/replacing alternator (N47 D20 O1)
Necessary preliminary work:
Read out the fault memory of the DDE control unit.
Switch off ignition.
Disconnect BATTERY EARTH LEAD .
Remove INTAKE FILTER HOUSING .
Remove INTAKE PORT .
Remove THROTTLE BODY .
Remove INTAKE PLENUM .
REMOVE drive belt for alternator.
Release connect ...