How do you reset the engine immobilizer after changing the key fob battery on a rover 114?

To reset the engine immobilizer on a Rover 114 after changing the key fob battery, first, ensure the new battery is installed correctly. Then, insert the key into the ignition and turn it to the "ON" position without starting the engine. Leave it in this position for about 10 minutes until the security light turns off, then turn the key to the "OFF" position. Finally, try starting the engine; this should reset the immobilizer.