Infiniti Q45 Oxygen Sensor

Hi Could U Please Tell Me What Oxygen Sensors I Need To Purchase For My Vehicle Thank U

The Engine Light Is On And The Dealer Said I Need To Replace A Read O2 Sensor.

I Was Told That My Oxygen Sensor At Station Or Stage One, Sensor 2 Was Bad. Where Is That Located And Is It Something I Can Change Myself?

Ok I Had To Replace My O2 Sensor, So I Bought It And It Came With Only Three Wires So I Took The Old Clip Off The Old Sensor Ran The Two...