The previous owner "spliced" the knock sensor harness into the wiring harness (its an absolute mess in there) and I am in process of replacing the knock sensor harness with a new Toyota OEM harness. Does anyone know where I could possibly source the original connector that was on the wiring harness itself? I could cut the connector off of the knock sensor harness and couple it to the wiring harness, but I would rather fix it properly if that's an option. My Google searching hasn't been very fruitful.

 

What engine and which year are you working on? If this is 3vze it should be a 1 wire harness to the knock sensor and personally I would be replacing it with anything substantial from oreillys. Definitely not gonna match oem quality though.

I know a few sellers on ebay. that sell connectors for oem toyota stuff and if you search through partsouq diagrams long enough, you'll probably find some sort of part# to reference.