O2 sensors located?

Well, Dave, I hate to tell you this, but Toyota changed a lot over years. The Toyota I am currently working on is a 2002 Toyota Highlander V6 3.0, with a TOTAL of Three O2 sensors. One each on each exhaust bank, prior to going into the cat, and then the heated output sensor that is located aft of the Cat goes up through the floor. Different Years, different setup.