Have an '02 Taurus that just rolled over 100k so I'm looking to change out all the O2 sensors before the weather gets too cold. I go to look up oxygen sensor in the old FSM to see what this is gonna look like and I can't find the term 'oxygen sensor' listed anywhere. Not in either the Fuel System or Exhaust System sections or in the back index. The closest it's referenced in one of the two previously mentioned sections is something like a 'catalytic monitor.' And nowhere can I find the procedure for changing them out.

Am I missing something here?

 

Good Morning !
It has to have an O2 sensor for each bank. Just follow the exhaust from the heads on each side of the engine down to the converter after which there should be at least one O2 sensor.
If you are considering replacing them all, for what it is worth, purchase Motorcraft sensors , preferably from Ford, then you should be assured of getting the correct sensors.
There are aftermarket sensors that will do the job, unfortunately not all come with the right connections. Learned the hard way, save yourself some trouble.