Dude, the bentley manual sux for our cars, and not many specific DIYs out there for us. I had to do my Tstat, looked at DIYs here and was expecting lots of headache. Did the job in 15 min. 5 min was taking the plastic under ride cover off. 1 min to pull the fan out, two clips, two harness connections. That's it. Thermostat was 3 bolts and a hose. What I have noticed is that the 4.8is is made like a race car. Working on it is just too easy. Could really be as easy as you think for the o2. Give it a shot, let us know. I just haven't gotten the need to replace mine yet. I get 11.7 mpg. NYC and heavy foot, the power and noise is irresistible.