I've still got my USB diag cable that I bought for the Octavia. I haven't found the diag socket in the cabin yet (haven't looked) but from what I've seen on the Lexus owners club, the socket should be the same, and the cables that was recommended seems to work the same protocols as mine, and it looks like VAG and Lexus use the same protocol.
Do you reckon I could get anything like sensible readings from the copy of VAGcom I have installed? I've heard some of the Lexus guys have picked useable data (codes etc) with a cable and borrowed laptop with a Saab program.
Or am I better off using something like wOBD