Behind the oddment holder to the right of the steering wheel (UK). There's a single screw on the upper surface of the holder. Once that's undone it just pops off if you pull it back. I have a Bluetooth OBD2 adapter connected with enough space to fit the oddment holder back on. It communicates with the Torque app on my mobile but this can't read all of the data. I think there are other connectors/locations for some of the car's other systems elsewhere but haven't gone much further into it. Hope this helps.