Griffin’s CarTrip is an OBD-II adapter that connects wirelessly to an iOS device or writes directly to SD card….See Details.
@TatWza

It stores information related to car mileage, even giving you a real-time efficiency readout on your display with the CleanDrive app. It’ll even pull warning codes the same when you go to your local mechanic and ask for a diagnostic, which is $90 a pop, this will run you $89.99 ONE time. Think about it, you run up on the mechanic knowing exactly what you need, he can’t beat you…as hard at least.
Source: Griffin