reverse engineering the higher-level protocols used on a Ford Focus yields some impressive (and amusing) results. see this video for a UI demo showing the full capabilities of the software package: https://www.youtube.com/watch?v=hpwBmTw7Gm0 we used the GoodThopter board, part of the GoodFET project: http://goodfet.sourceforge.net/hardware/goodthopter12/