@RobertS.Barnes I don't know - I don't do tuning myself. I was trying to diagnose a code that the wife's car was throwing. I found the software + my laptop to be a handy combination in diagnosing the situation as almost certainly a bad O2 sensor (rather than a replace-all-the-cats situation).

With the price of the code reader + O2 sensor, I still came out ahead of the shop's proposed fix by several orders of magnitude.