From Autocar..............
Whichever way they gain access, once in the car the thief plugs a hand-held ‘key fob’ programmer, freely and legally available on the internet, into the car’s on-board diagnostics (OBD) port to record the car’s vital systems data. Car makers are obliged by law to permit rival services to access the OBD, hence the existence of such devices. Once the fob is programmed - which takes less than 15 seconds - the thief is in control of your car.
