Immobiliser problems?

I am trying to find out if the immobiliser system on a 2.3 automatic Ford Galaxy 99 'V' can be bypassed. I had an intermittent fault initially where the immobiliser would not go off after i had inserted the ignition key. The coil around the ignition barrel has been changed, the keys have been re-coded to the original setting, the ECU has been replaced, The Relay 30 has been checked, the wiring loom has been re-done and the modulator has been checked. I have had no car for 10 weeks now as it has been sat in a garage with a number of people trying to find the fault, Please help, any ideas is welcome......i can only think of one SCRAP IT!!!!!