This post show you guide on how to repair BMW F18 520 105201 trouble code.The vehicle dashboard with engine warning light on.More repair cases about BMW,please check here:BMW Trouble Repair
BMW 105201 Trouble code:
Ambient Pressure Sensor (pressure too high)
According to the DTC,the ambient pressure sensor is located on PCB of ECU.So you need to remove PCB out of ECU to repair sensor.
After then replace a new ambient pressure sensor SMD284,install all components back on vehicle.Then test vehicle,the warning light off,the trouble has been solved.