on an 02 lexus rx300 is bank 1 sensor 1 and bank 2 sensor 1 on the same O2 sensor?

Question

they are one in front of the other or in line i guess you would say?its giving codes P1135 & P1155

Answer 1

P1135 A/F sensor heater circuit malfunction Bank 1 Sensor 1

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

These 02 sensor are the upstream 02 sensor which is in front of the catalytic convertor, when you set both these codes together check the A/F heater circuit fuse which is located in the engine fuse /relay box listed as A/F heater which is a 25 amp fuse