I've used Torque Pro for quite a while, and like to monitor various functions, and verify how the car is operating. Tons of diagnostics make it easy to know exactly what's happening, you customize what you need. For $5 and a cheap ELM 327 scanner module under $15, you can scan codes and clear them from the app. It's like having a toolbox in your phone, I leave the adapter in all the time.
Here's a screen capture while I'm taking a short drive

 

See what your car is doing in Realtime, get OBD fault codes, car performance, sensor data and more!
OBD is used in Car Scanner vehicle / car performance / trip computer / diagnostics tool and scanner that uses an OBD2 Wi-Fi or Bluetooth adapter to connect to your OBD ii Connector engine management / ECU.

1. Step 1: Plug the www.mapout24.com/product-category/obd-diagnostic-cables/]OBD scanne[/url]r into thewww.mapout24.com/product-category/obd-diagnostic-cables/] OBD por[/url]t. ...

2. Step 2: Turn on the ignition. ...

3. Step 3: Enter the Vehicle Identification Number. ...

4. Step 4: Find www.mapout24.com/product-category/obd-diagnostic-cables/]OBD codes[/url] in the menu. ...

5. Step 5: Interpret the first character of the OBD code. ...

6. Step 6: Interpret the second character of the OBD code.

1. Step 7: Interpret the third character of the OBD code
2. Step 8: Interpret the final characters of the OBD code