I was on a Porsche club rally, and we were coming back from Adelaide, a 3,000 km trip. Australia is a big place! We had pulled into a motel for the evening, and we were 11 cars, every one a Porsche 911. I got out, pushed the locking button down on the driver’s door and swung the door shut. As it clicked into place, to my horror, I saw that the keys were still in the ignition. What to do? Porsches are just about thief-proof, and none of us were accomplished car thieves like Nick Cage in the great movie “Gone in 30 seconds”. In desperation, I asked for the other 10 driver’s keys and tried them in my door lock. Amazingly, the keys from the 911 parked closest to mine opened my door! And just as amazingly, my key would not open his, though his would open mine. But neither key would operate the ignition of the other car. I was certainly lucky that evening.
So never rely on your new car being thief-proof.