This may be irrelevant but I thought I would post it. I have a 2006 V6 Camry. Same thing, same codes. I would reset the code and everything would run fine for a year in the beginning, then to a few months, then to a few days and then the reset would not work. After the reset and driving the car for about 30 miles, the car cleared emissions test with no code. I did not want to spend a lot on an old car. Eventually, after going through a long think, I changed the front bank oxygen sensor. This was about 2 years ago. All fine - no problems after that, no codes. Cost me about 60 bucks to get a new sensor from Advance Auto Parts. As I said, it may be irrelevant, but this is my story.