Programming new PATS keys with OBD2 interface (USA)
Our used 2005 Focus came with only one ignition key. The local Ford stealership wanted about $200 for 2 new keys and PATS programming. Instead, I ordered 2 cut Strattec keys (photo sent to locksmith) for $34, an OBD2 to USB interface modified for access to the correct car network, and with FORScan programmed the new keys into my car's PATS system in 5 minutes. Beforehand I had read up quite a lot on instructions and caveats to make sure I didn't mess it up (there are a few precautions to take).
If anyone needs more info just ask.