Freematics Forum

So you didn't connect adatper's VCC? It should work with universal ground. Can you check what Teensy receive from the adapter? Is it in plain text?

The 5V output of the OBD-II adapter is fully regulated. So the VCC should goes to Arduino's 5V instead of VIN.

What's the compiler error message?

It's correct. VCC is 5V on Arduino.

I have no idea what caused this. I have never seen it on my end.

To use the SD socket on the LCD shield, you need to enable software SPI. Check this out:
http://forum.arduino.cc/index.php/topic,65918.0.html

BLE output are also available on Rx and Tx pins.

Yes. VIN is not available.

Add this line before inclusion of OBD.h

Is the file MPU6050.h good?