Got around to changing this. Not that I'm sure it needed it, just on general principle. The original looked OK, but as long as it was out, I went ahead and stuck a new one in there. (but I compromised, used an Autozone one
I was able to get a wrench on it in there. You have to pry off a clip that sits on the top of the bolt first, they route another cable thru at the same spot.
Clean area around the sensor, remove bolt. Gently twist sensor as you pull, should come out easily.
The original looked OK, once the oil was wiped off:
Very tight quarters in there, got scatched up a bit.
Hint: attach plug to new sensor before installing it.
Feel free to add info, just thought I'd snap some pics in there.
1999 GLS MP90 supercharged / 2003 GL MP62 supercharged / 2004 GLS stock
Magnuson MP90 / TOG's / 3 in. Magnaflow exhaust / MSD ignition / LS1 MAF / Racetronix pump / HP Tuners / TCE 68mm TB / 36 lb Inj
= Best track time: 12.951 @ 104.48, 1.839 60 ft. (Beech Bend Raceway Park, 11-23-13), 50 Deg. F