Help with 02 sensors diagram

What is your question?

My engine service light came on and I took it to autozone to get a scan of the problem. They said it was Bank 1 sensor 2, which told me that it was the one right before the Catalytic convertor on passenger side. Well is it up front or the rear one on the passenger side? I changed the first one and the code went off for about 5 miles and then came back on. I don't have any cats and have the MILs on the rear. So my questions is, is it the front sensors or rear sensor? Help please.