DTC B1B40-96: Left Front Outer Sensor - Component internal failure: Action

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, 2016 Land Rover Range Rover, 2015 Land Rover Range Rover, and 2014 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This DTC will log if the local ground of the sensor is open circuit

Refer to appropriate system wiring diagrams and check the front bumper harness for damage/corrosion. Check sensor circuit for short circuit to ground, open circuit. Repair or install a new wiring harness as necessary
Check the connector for integrity and damage, then reconnect sensor to confirm connection
Using JLR approved diagnostic equipment, clear the DTCs and perform routine - On Demand Self Test (0x0202)
If the problem persists remove the suspect sensor from the bumper. Inspect the sensor connector for signs of water ingress/corrosion. Exchange the relevant sensor with a fault-free sensor. Clear the DTCs and perform routine - On Demand Self Test (0x0202). If a DTC is set for the new position of the suspect sensor, install a new sensor