Code p1135 what wrong help,toyota 2000,highlander

2000 toyota highlander 6 cylinder,code p1135

That code is specific to the Air-Fuel Ratio (A/F) Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P1135 Trouble Area:

Open or short in A/F sensor (bank 1, sensor 1)

A/F sensor (bank 1, sensor 1) heater

ECM.