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How do you reset the engine immobilizer after changing key fob battery on a range rover p38?

To reset the engine immobilizer after changing the key fob battery on a Range Rover P38, please follow these steps:

1. Make sure that you have a spare working key fob.

2. Enter the vehicle and insert the working key fob into the ignition.

3. Turn the ignition key to the "ON" position.

4. Do not start the engine.

5. Press and hold the "Unlock" button on the working key fob for approximately 10 seconds.

6. The engine immobilizer should now be reset and the engine should be able to be started.

If the engine immobilizer light is still illuminated after following these steps, you may need to take your vehicle to a Land Rover dealer or specialist to have it reset.