I'm actually surprised that the search came back empty on this subject. Anyway... Are there any apps available for android that allow you to check engine codes and reset your check engine light? I know there are cables available for WinMo units that allow you to interface via usb... but I doubt any phones available right now have usb-host. There are also Bluetooth and Wifi dongles available, which would be more plausible for this sort of thing. (I believe the older phones like the G1 only had bluetooth profile for headsets, but I don't know about the newer phones.) Also, I know apps like this exist for the iPhone. This is an example: iPhone OBD-II app - Hack a Day If nothing like this exists, perhaps a developer would like to take a stab at it? I'm sure it would gain quite a bit of interest.