How do you reset an immobiliser on a 1997 opel astra?

To reset the immobiliser on a 1997 Opel Astra, first ensure that you have the correct key for the vehicle. Insert the key into the ignition and turn it to the "ON" position without starting the engine, and leave it there for about 10 minutes. After this period, turn the key back to the "OFF" position, then try starting the engine. If the immobiliser continues to activate, you may need to consult a professional or refer to the vehicle’s manual for specific troubleshooting steps.