O2 Sensor questions

Hey guys, so I've have a cel light for my o2 sensor for about 2 weeks now. Today my wife took the car to do some errands and car went into limp mode. It feels can of the same as when I had a bad coil but I still have power. The only cel light is the one for the o2 sensor. It says bank1 sensor 2, I've searched and have no clear answer. Maybe I'm searching wrong but can someone tell me which one this is? Post or pre cat? Any info would help. Thanks

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It would be pre cat CBFA (uses 3 sensors)
It would be post cat on CCTA (uses 2 sensors)