How do you clear the codes for AA 1999 range rover?

To clear the codes on a 1999 Range Rover, you'll need an OBD-II scanner compatible with the vehicle. Connect the scanner to the OBD-II port, typically located under the dashboard, and turn the ignition to the "On" position without starting the engine. Follow the scanner's instructions to read and then erase the trouble codes. After clearing, turn off the ignition and reconnect the battery if necessary to reset the system.