With a low remaining range:
The Check Control message appears continuously below a range of approx. 30 miles/50 km.
Refuel promptly
Refuel no later than at a range of 30 miles/50 km or engine operation might fail and damage might occur.
BMW X3 Service & Repair Manual > Transmission shafts: Replacing radial shaft seal for actuator shaft (atc 450)
Special tools required:
11 1 200
11 1 380
23 0 490
IMPORTANT:
Read and comply with notes on protection against electrostatic discharge (ESD protection).
After completion of the repair work, CHECK TRANSMISSION OIL LEVEL and top up if
necessary.
Use only the approved TRAN ...