02 Solara SLE V6 Check engine P1135

[Slytiger]

I've got a CEL and I took it to Autozone. The readout came back with a P1135 code Air/Fuel sensor heater circuit response. I would like to replace the sensor myself, but I would like to find out: 1. The cost & part number orf the sensor. 2. the location of the part (pictures preferred), 3. Procedure for removal & replacement. 4. Degree of difficulty or pitfalls I can expect while doing this repair. I've been searching the internet for info, and the step by step instructions, but I haven't found a lot of useful info. If you can help or point me in the right direction I would certainly appreciate it.