DTC C1A05-26: Left Rear Height Sensor - Signal rate of change below threshold: 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.

Check height sensor linkage is securely connected and not damaged. Visually inspect the height sensor for security, damage and correct orientation/installation. Check the sensor connector for damage. Repair/renew as required, clear the DTCs and retest
If the fault persists, refer to the appropriate system wiring diagram and check rear left height sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair circuit as required, clear the DTCs and retest