Comment by PinguTS 16 hours ago
Funfact: in the past Ford and Volkswagen had only a number of different variations for the coding of the physical keys. So that you could open and start several cars with the very same physical key.
I assume that this was also true for other brands.
That's a good start. To do better you'll need to do some reading or watch a ton of youtube videos to identify the keys that will get you the most bang for the buck.
I think mine has something like 20 keys on it now, and it will open a truly surprising number of things that it shouldn't.
This happened to me! Friend had a similar car and at night they went to mine and the door unlocked but the car wouldn't start. The door only had a few pins it checked while the ignition used every pin. We compared our keys and sure enough one part of it was the same.
OBS Ford F-150s do this and it's not common knowledge even among enthusiasts. The back 4 pins work the door, the front 6 or so pins work the ignition. A common problem is that the ignition barrel keyswitch dies and you have to replace it, but then you have separate keys for the door and ignition. I took the new ignition key to a locksmith and had him copy the 4 back pins from the factory key, and I was back to a single key!
My mom amd my friends mom both drove toyotas, completely different models and many years apart. By coincidence the key for my friends moms car worked for my moms, for unlock and start, but, my moms could only unlock the other one.
Many fleet vehicles are still this way. The 1284x key, for example, can open a surprising number of things including many older police vehicles.
A few hundred dollars more on Amazon will net you a magic keyring that can open a surprising number of vehicles, buildings, control systems, and vending machines.
If you're into that sort of thing check out Deviant Ollam's physical pentesting videos on Youtube.