Originally Posted by AC Schnitzer

My house got broken into with car keys stolen but car remains. Reason being that they needed the keypad code which is 1 thing.

The 2nd thing is that if somehow a person has a replica key that fits nicely, they still wouldn't be able to start your engine because the key itself contains a code which will be authenticated before you may start the engine.

So you have 3 failsafe which is the keypad code, code on the key and the key itself. Of coz a determined and professional body would be able to jack any car if they wanted to but its the level of deterance you provide to deter them from stealing your car.