I recently bought an Audi a3 2.0 bpy. It had a broken timing belt so we had the head rebuilt. After repairs the vehicle cranks and doesn't start. The timing is on point we have , crank signal, fuel, air and spark. Checked coding on all the modules and discovered there are no codes under the immobilizer module but the coding for the module comes up 0000000. I have only the valet key. Does the immobilizer need to be reset? Do I need to have a fob and have new keys programmed?