How do you reset a 1997 Ford Transit immobilizer?

To reset the immobilizer on a 1997 Ford Transit, first, ensure 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. Leave it in this position for about 10 minutes until the security light turns off, then turn the key back to the "Off" position and try starting the engine. If the immobilizer remains active, you may need to consult a professional or refer to the vehicle's manual for further assistance.