Would someone be interested if I would design a 'USB to ISO9141 K-Line interface' and post all the files (Eagle schematic + board and the Gerber files) on this forum so you guys can make one for yourself? The device will be based on a FT232H from FDTI Chip and a MC33660BEF from Freescale.
If enough people are interested I will design a PCB, free of charge of course. As I will not be able to help others on this forum due to my lack of knowledge about tuning, this way I might help. Let me know!