Necessary preliminary tasks:
NOTE: Extract brake fluid out of expansion tank. Use a suction bottle used exclusively for drawing off brake fluid.
Do not reuse drawn out brake fluid.
Disconnect plug connection (1).
Release retaining screw (2).
Detach expansion tank (3) by pulling vertically upward.
IMPORTANT: Check rubber plugs (1) in brake master cylinder for damage and replace if necessary.
Push the expansion tank vertically onto the master brake cylinder.
BMW X3 Service & Repair Manual > Oil pressure/oil temperature/oil gauge: Replacing engine oil level sensor (N52T)
IMPORTANT:
Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .
Necessary preliminary work:
Switch off ignition.
Remove REINFORCEMENT PLATE .
Drain ENGINE OIL .
Release connector (1) and remove.
Unscrew nuts.
Remove oil level sensor ( ...