O2 or air/fuel ratio sensor
 

Hi, I recently had check engine codes p171 and p2196 light up on my 2006 tc.

Sensor on the bottom, exhaust, s-pipe had no resistance, but the car was pushing 12dcv to the adapter, so I'm fairly sure the sensor needs replacing

Is this sensor an oxygen sensor (89465-06050) or an air-fuel ratio (89467-06030)?