I am sure this has been discussed TO DEATH on this forum at one time or other or. . . However, with the cost of OBDII scan tools anyhere from nearly free to hundreds of dollars, I thought I would toss in a recent experience. This involves my 2013 Mustang GT 5.0. I have run a FIXD bluetooth that came with the car and the FIXD software for a year. I recently bought the premium version of the app, Torque after using the free lite version for awhile. It is a great improvement over the FIXD app as it avoids all the annoying opinions about the severity of issues. Now comes along a Chinese version of the plugin Bluetooth scan tool which I will not name except to note that I got mine from ebay for twenty five cents! Thats right, $0.25! When I set this up in my car and selected the 11bit, 500k OBDII protocol my car uses, Voila, lift off with all OBDII sensors and systems reporting and all the gauges and styles you could want available. This in addition to acceleration, various time and distance functions and on and on. A quarter and 2 bucks shipping - from China.