Actually that code is for ban2 sensor 1 P1155 - A/F Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
The A/F sensor has the characteristic that provides output voltage* approximately proportional to the existing air-fuel ratio. The A/F sensor output voltage* is used to provide feedback for the ECM to control the air-fuel ratio.
By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air-fuel ratio and control the proper injection time immediately. If the A/F sensor is malfunctioning, ECM is unable to perform accurate air-fuel ratio control.
The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust
gas is low), current flows to the heater to heat the sensor for accurate oxygen concentration detection.
*: The voltage value changes at the inside of the ECM only.
This is the most common failure on a Toyota air fuel sensor, the heater circuit. If you replace the unit only use and air fuel sensor, not an oxygen sensor
Let me know if I can help further,