[SnowmanPA]

I recently changed the Rear AF sensor on my 05 Touring. Surprisingly, it was pretty easy, not nearly as bad as I had anticipated. In the picture I posted (if it works) the sensor is actually accessed from the top, not underneath the car. You'll have to do it by "braille" but a flashlight and inspection mirror will help. You will need an o2 sensor socket from Autozone for about $12. Worth it's weight in gold. The hardest part will be figuring out how to disconnect the "childproof" (and nearly adultproof) electrical connector without being able to get a good look at it.

It took me all of 15 minutes, tops. Good luck!