IMPORTANT: The brake pad wear sensor must be replaced once it has been removed (brake pad wear sensor loses its retention capability in the brake pad).
If an already ground brake pad wear sensor has to be replaced although the minimum brake pad thickness has not yet been reached, it is necessary to file down the new sliding contact with a file to the same length as the ground sliding contact.
Necessary preliminary work:
Unclip line from holder (1).
Open housing cover.
Disconnect plug connection (2).
Installation note: Make sure the plug connections snaps in correctly and the line is fitted correctly in the holders.
Unclip line from holders (1).
Installation note: Ensure proper locking of the holders and proper seating of the line in the holders.
Disengage line from brake pad wear sensor from holder (1).
Pull brake pad wear sensor (2) in direction of arrow out of brake pad.
Installation note: Make sure brake pad wear sensor (2) is correctly seated in brake pad and holder (1).
BMW X3 Service & Repair Manual > Electrical: Preheater plugs
REPLACING ALL GLOW ELEMENTS (N47 D20 O1)
Special tools required:
11 6 050
12 2 300
NOTE:
When one or more glow elements are replaced, the preheating control service
function must be started with the BMW diagnosis system before replacement
and the "Security data record in the preheating ...