The oxygen sensor's are heated. so I guess that's where you are comming up with the word heated.
Bank means- what side of the engine that the oxygen sensor is on. Bank 1 or bank 2
There is a cover plate on the front bank of the six that could possibly be the mount for a block heater. I am not aware that Toyota offers a block heater. Maybe.
location of the O2 sensor heater on a 1998 GMC 5.7
Bank 1 sensor 2 oxygen sensor heater malfunction.
O2 sensor heater circuit malfunction, Bank 1 Sensor 1.
P0042 HO2S Heater Control Circuit (Bank 1 Sensor 3)
O2 sensor Heater Bank 1 Sensor 1
p0030 is ho2 sensor bank 1 sensor 1 heater curcuit
Heated oxygen sensor heater circuit malfunction (bank 1, sensor 1): Open or short in heated oxygen sensor heater circuit Heated oxygen sensor heater malfunction (Haynes Repair Manual)
Load circuit
It means your sensor heater in Sensor 1 or Bank 1 is malfunctioning. Get it replaced.
Oxygen sensor heater malfunction (cylinder bank #2, sensor #1)
Bank 2, sensor 1, O2 sensor heater circuit malfunction.