[jabart]

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.

[thrtythreeforty]

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!

[devmor]

I had a similar experience once when I drove a Prius. Walked out of the grocery store, hit the unlock button, got into my car, then wondered why the seat was too far forward - before realizing it was not my Prius.