Hi Foxy The only problem with bypassing the immobilizer, is if the car is nicked and the insurance checks it out and find its been tampered with the may not pay up a theft claim ! The best thing is to find what the problem is, so why don't you ask on here and say what is or not happening, and give some sort of times it happens and what has the "mechanic" done to fix it Radiotwo i have tried but everything people have suggested ive done and it hasnt worked ive changed the glow plugs ive changed the relay and ive changed the crank sencor. when it went on the machine it said glow plug relay disconected so i changed that i have no idea what else to try