Car scanner ELM327 app
 

Using the app, how do you know which connection profile to use? Many seem to work with my Tucson, some providing more data than others. If I want to read something like the ATF temp, which is limited to specific profiles, is there any danger that selecting the wrong profile will give me the wrong temperature?

I would like to say no, but the best thing to do is see what temps it does give from both profiles.