Hey guys... I finally did it. I replaced my knock sensor. All by myself!!!!! And a secret "UBER-4th-GEN-MAXIMA-KNOCKSENSOR-WRENCH"
So here's that pesky little thing, way down in the nether regions of VQ.
My first attempt was with various ratchets that I had on hand. After about 45 minutes of attempting to get a socket on that bolt, I find that the monkey wrench was my best bet. And I also discovered my hand can squeeze down there!!!

After taking a few wrenches down there, I found out it's a 12mm wrench

But I couldn't get the stupid thing to turn. The bolt was on too tight.
By this time, I threw off the latex gloves that kept getting torn up and I had shredded up my hands nice and purdy....
Enter the UBER WRENCH....
Well after several more attempts with various contraptions, ingenuity/ignorance/stupidity allowed me to arrive to this beauty....
(yes, that's a torque wrench 1/2" drive -> 5" extender 1/2" drive -> 1/2" to 3/8" converter -> 3" extender 3/8" drive -> 3/8" to 1/4" converter -> 1/4" swivel tip socket -> 12mm socket)

This thing allowed me to get the bolt off without even getting my hands in that tight spot. I had a little trouble putting it back together but nothing too bad.
I'll be happy to demonstrate on any future knock sensor that needs replacing!!!
Time for a cold one....
Oh, btw I also found that the magnet on the stick is a PRICELESS tool to have on this project to fish out dropped wrenches, bolts, bling, etc etc....