Toyota Repair: 2001 Avalon OBD 2 question, obd 2, air fuel

Question
2001 Avalon displaying P1155 code which translates to Air/Fuel sensor Bank 1 Sensor 2.  What's the problem and solution?  Thanks

Answer
This code is for the A/F sensor Bank 2 sensor 1 heater circuit, this is a very common failure, the sensors are heated to make them work faster during warmup, the heater circuit in the sensor failed which will require replacement of the sensor. Bank one is located near the firewall, the sensor is located on the exhaust manifolod.