is the "Bank 1 sensor 2" O2 sensor the one after the cat?

Not sure which one in which

 

Should be the downstream sensor drivers side.

 

Bank 1 is before the CAT, Bank 2 is after the CAT.

 

Rather than type it all out here's the first Google return.
http://o2sensors.com.au/static/o2-sensor-identification-and-locations

 

Bank 1 is drivers side, 2 is passenger side. Unless you have an engine where cyl 1 is on the passenger side, but I believe most Toyo's are driver side. Not knowing what OP has, best guess here.

#1 is front, #2 is rear. So bank 1 sensor 2, drivers side 2nd sensor. On 4cyl engines you'll only have bank 1 sensors, OBD codes are pretty generic.

 

Mine are all passenger side.