Where is the Knock sensor located?

[Fighto78]

Subject says it all. Bought a 240 and it's pulling a code for the knock sensor and I'm planning on going to a pick and pull to grab a new one. I just don't know where to look for one since I have no clue where it's located.

[Structure240sx]

o man have fun with this. its on the engine block under the intake manifold in between cylinders 2 and 3. or could remove the intake manifold or u can move the fuel lines out of the way or jsut take off the fuel rain u can jsut barely get to it. use a 10mm socket i belive with an elbow joint thing. good luck