This OBD2 reader uses a multitude of apps, but for my situation I downloaded the app OBD JScan and plugged it in. It connected right up with the app once it loaded up and only $20 to be able to change my tire size, TPMS setting/threshold for when it comes on/off, that annoying seatbelt ding, and it allowed me to run live data on air/fuel ratio, Intake temp, coolant temp, misfires on each cylinder, and a bunch of more things.Truly the best budget tuner on the market. $50 and my wrangler is drivinSee full review