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2012 OB , 2017 Impreza
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On most scanners, the O2 sensors are labelled "S1" and "S2". (not to be confused with "bank" 1 and 2)
  • S1= upstream
  • S2= downstream
 

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2012 OB , 2017 Impreza
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I have all these O2 readings and cannot for the life of me figure out which is the actual O2 vs. the upstream Fuel/air sensors.
The AIRFLOW sensor is the MAF sensor. (Mass AirFlow) It usually measures in grams/second (g/s)
I am not sure what you mean by "FUEL" sensor...there may be "fuel pressure" sensor.
 

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2012 OB , 2017 Impreza
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I HIGHLY suggest you spend some time reviewing Utube videos from
Both of these guys are professionals who have several videos available showing how to diagnose underperforming catalytic converter using codereader to review PIDs. (realtime data)

Do not make the mistake of looking for Subaru videos.... The process of troubleshooting is essentially the same on ALL vehicles.
 
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