The reason that I have it is that it's very flexible and can be configured to read any OBDII parameter - BUT more importantly, this app LOGS DATA once the parameters are chosen and configured. So I can do a cold start and watch how the O2 sensors respond from cold to fully warm, and/or I can measure the MAF signal over time while measuring the O2 sensors and STFT (short term fuel trim). After some time interval, I can stop logging and send myself the log file (*.CSV) in a text or email. I can open it up and view it graphically or numerically in Excel.
I have not used this function often on the two SAABs that I now maintain, but it was invaluable in trouble-shooting a couple of issues on my 2005 BMW. It's not just that it logs the data, but that the logging is configurable and easy to send to my PC. I still use my corded OBDII reader for all the simpler stuff because I don't have to configure anything or set it up for a particular vehicle.
Hope this explains why you might want one in addition to your old OBDII.
Mark in Marine
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