DTC B1B40-12: Left Front Outer Sensor - Circuit short to battery: Action

Refer to appropriate system wiring diagrams and check the front bumper harness for damage. Check sensor circuit for short circuit to power. 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