So easy to do when you understand how rolling code RF transmitters work! When you actually realise the method they use, you'll realise how fantastically insecure it is!
Unfortunately pretty much every car is based upon them... If you're intent on driving off with it, it's a bit more difficult...
BMWs for a long time you could smash the window without even setting off the alarm, program a new key and drive off... I think software updates fixed the OBD port being active when the car is alarmed, but there's enough out there without the patch that are still relatively easy to steal.
Unfortunately pretty much every car is based upon them... If you're intent on driving off with it, it's a bit more difficult...
BMWs for a long time you could smash the window without even setting off the alarm, program a new key and drive off... I think software updates fixed the OBD port being active when the car is alarmed, but there's enough out there without the patch that are still relatively easy to steal.