The speedometer stopped working after clearing codes?

I ordered a Bluetooth OBD scanner and hooked it up to Torque on my phone because I had a check engine light and wanted to diagnose the problem. The codes are leaning to the o2 sensors. So, I reset the codes that night to see if they same ones came back up. I got in the car the next morning and started driving and noticed that the speedometer was not working, and the odometer was not changing, it was stuck on the same mileage. I have the scanner still hooked up and have been viewing the real time information. It is showing me the car's MPH based off the OBD. What could be the issue?