where is heater control circuit bank1 sensor1 2003 lexus es300

Question

wher is heater control circuit bank1 sensor 1

Answer 1

P0031 Oxygen sensor heater control circuit low (bank 1 sensor 1)

The heater control circuit is in the ECM,The most probable cause is the 02 sensor, The heater element of the 02 wears out its job is to maintain a set temperature of the 02 sensor, The location of the 02 sensor bank 1 is where cylinder number 1 is located, sensor 1 is the one closest to the engine