Hi all I have a 53 plate C8 2.2hdi. I have had diagnostics done and loads of faults have been identified but are unable to clear. Car will not start but will run on easy start. The faults range from hazard lights to air con, interior lights etc. Also immobiliser fault. Technician said that it seem to be the bsi. Would it be easier to change the bsi ecu fuse box keys etc or is there anything else that I should know. I have also tried the reset but windows will not go down. Also bought new battery for it incase voltage was not being achieved.