Complete beginners or anyone needing dealer-level programming (PCM flashing, key fob pairing).
I’ve been using the for a few weeks with a generic ELM327 Bluetooth adapter on my 2012 Toyota. Here’s my honest take. hhobd advanced app
If you have an Android phone, a $10–15 Bluetooth OBD2 adapter, and some patience to learn the menus, HHOBD Advanced is a solid free tool. For the price (free), it outperforms many paid apps in raw data access. Just don’t expect polish. a $10–15 Bluetooth OBD2 adapter