How do you reset immobiliser on transit 04?

To reset the immobiliser on a 2004 Ford Transit, 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. Leave it in this position for about 10 minutes until the immobiliser light goes off, then turn the key to the "off" position and try starting the engine. If this does not work, you may need to consult the vehicle's manual or a professional locksmith for assistance.