Necessary preliminary work:
Remove filter cover (1) in direction of arrow.
Unfasten plug connection (2) and disconnect.
Unlock retaining tab (1) and remove AUC sensor.
Installation note: Retaining tab (1) on AUC sensor (2) must not be damaged.
BMW X3 Service & Repair Manual > Electrical: Preheating relay
REPLACING PREHEATING CONTROL UNIT (N47D20 O1)
Necessary preliminary tasks:
Switch off ignition.
Remove INTAKE SILENCER HOUSING .
Release positive battery cable (1) from clamp.
Release expanding rivets (2).
Remove rear acoustic cover (3).
Detach connector (1) from preheating contro ...