ElmScan 5 Compact Scan Tool
Product Review (submitted on July 11, 2012):
Works exactly as described. Included software was easy to install in my laptop and the hardware connected to my car without a hitch. My check engine light was diagnosed as a failing catalytic converter but in the past this fault has appeared when the engine oil gets too low (old Honda with 140,000 miles that burns some oil). I added oil to the proper level, reset the check engine light, and after a week of driving the light hasn't come back on so it appears that it was a false reading as I suspected. My dealer would have done an expensive replacement of the catalytic converter, so its paid for itself many times over. I like the fact that there is other software that can use this hardware and that the software can be updated. This means that unlike the hardware only devices, this thing will work for a number of years to come and will presumably work with a new car when I replace my Honda.
-- April 15, 2012