We have just tested the OBD II VAG KLL interface with FlowStone.
This is a vehicle diagnostics cable and allows you to read your cars internal computer data, re-set service lights etc.
This uses the FTDI serial to USB chip so that this device appears as a virtual Comport on your PC. This means that you can use the FlowStone Comport module to access the data.
Here is an example of the OBD II data codes for audi cars: