P1155 Toyota -2002 highlander

Question

I just had a p1155 code on a 2002 highlander and i looked it up and it said 02 sensor
bank 1 sensor 2 i replaced it and my check engine light is still on . any suggestions. I also reset the system by disconnecting the neg cable on battery while replacing the sensor.

Answer 1

P1155 A/F (airflow) sensor heater circuit malfunction Bank 2 Sensor 1

The trouble area for this code condition are A. Open or short circuit of A/F sensor B. A/F sensor heater. C ECM. Power to the heater circuit needs to be check it should be battery voltage. If good then test heater control (-)  .Which is connection E8 or AFL (-). With key on engine off you should have battery voltage. Once the engine is started the voltage should switch to be ECM gound .Bank 2 is where cylinder number 2 is located . Sensor 1 is the upstream sensor.