Went to do the right (back) bank O2 sensors in the Town&Country tonight because despite being at 58k miles, they went. Dealer wanted $500 to do the pair. I got the parts for less than $100 total.
Upstream (ahead of cat) one came out no problem. Downstream is still in there despite me using every bit of my 200 pound muscled, chiselled body to try to get it out. Even with a breaker bar, all I succeeded in doing was spread the split-socket.
See you tomorrow O2 sensor!
(Psychosteering Caddy for your troubles.)