AndrOBD

AndrOBD allows your Android device to connect to your car's on-board diagnostics system via any ELM327 compatible OBD adapter, display various information & perform operations. It is open source and completely free. The application also has a built in Demo mode that simulates live data, so you don't require an adapter to test it.

OBD Features

Read fault codes
Clear fault codes
Read/record live data
Read freeze frame data
Read vehicle info data

Additional features

Save recorded data
Load recorded data (for analysis)
CSV export
data charts
dashboard
head up display
Day-/Night view

https://github.com/fr3ts0n/AndrOBD