Graphic is only an example. There may be differences in specific details depending on engine version.
Unscrew all bolts.
Remove underbody panelling (1).
Installation note: Make sure underbody panelling (1) is correctly seated.
BMW X3 Service & Repair Manual > Shift valves, parking lock: Manually releasing parking lock (from vehicle underbody) transmission GA8HP
For various tasks, it is necessary to unlock and lock the parking lock.
This can be done from inside the passenger compartment or underneath the vehicle.
Before releasing the parking lock, secure the vehicle against rolling away.
In the event of a power supply interruption, e.g. flat batter ...