Guides

Answers to what people actually ask about OBD-II, iPhones and their cars.

• Which OBD2 adapter works with iPhone?

  Why it has to be Bluetooth Low Energy, why Classic Bluetooth and Wi-Fi adapters fail, and which to buy.

• How to check a used car's fault codes before you buy

  Including whether they were cleared just before the viewing.

• Check Kona Electric / Niro EV battery health from your iPhone

  The battery's own state of health, from its management system.

• Fault codes explained

  What each common OBD-II code means, how serious it is, and what to check first.