OBD JScan

Excellent app. Worth the money for in app purchase, though you can still see a lot of information in free version. Do yourself a favor and buy one of the listed compatible dongles. I had two very cheapies and neither would allow full functionality (but did allow to connect and read codes). Impressive amount of modification options. Just a really great app if u are modding a Chrysler/Jeep/Dodge. There is a free demo mode that requires no dongle but let's you see what is available for your model.

I don't usually post review but this app deserves one. It allows you to change tire air pressure sensor and tire size/drive ratio settings to accommodate changes you've made to your vehicle. It also has tons of other options and modules that can be activated and deactivated through the app. If your not sure it will do what you need d/l it and browse the demo. It does require a OBD2 adapter, but they're inexpensive. 100% worth the price. A big thanks to the developers.

What a difference an app makes! I drive a 2011 JKU with 35 inch tires and a 3.5" dealer installed lift. Always wondered if the computer onboard the Jeep was updated after the lift, which I found out is was not via this app. Using a GPS to determine the actual speed, I found it was 4MPH too fast. I then adjusted the actual speed to be correct using the app. It is AMAZING what the change did by simply correcting for the 4MPH caused by the tire size. It is abundantly obvious that the (auto) transmission shifts when it should now as compared to not shifting as it should before. The Jeep runs so much smoother and fuel economy has improved. All the other app features are great, but I am so thrilled for this easy and quick adjustment.

Update: 11/28/24 - after troubleshooting for a day or so, figured out what the problem was, seems as if it was on my end with phone. Thank you for your quick response here! Update: 11/26/24 After the app updated twice within a few days, not working like it did. For example tire size adjustment never finishes then I have to back out and keep getting a error the app closes. 2015 wrangler. Better than expected!!

Fantastic app, worth every penny. My Ram 1500 had air suspension issues. The dealer, and even a tire store could not figure out how to fix the leaning truck. Bought one of the approved dongles and this app as a last ditch effort. I recalibrated and leveled the truck myself in about 20 minutes, and it wasn't even that hard. Modified other little handy things like fog lights that stay on with the brights, replacing lightbulbs with LEDs with no flickering, and getting rid of the seatbelt dinging.