Any Emulators with OBD2 emulator?

I try to understand a little more about the Arduino- OBD2 possibilities.

I can buy an OBD2 emulator for the project. And begin to hart-test it physically. But why take the cost if there is no point?
Would really like the possibility to start in an emulator on the computer.

Anyone know if some of the emulators (like Simuino, Virtual Breadbord or 123d) have an OBD2 emulator project ready to work out from? If it has the BMW ISO 9141-2 OBD2 it's even better.