If you do this yourself,

And you do replace the knock sensor, which is under the intake manifold, hard place to get to later....

The torque spec is 51 in-lbs for the knock sensor. Took me a while to find that number, got it from a Toyota Tech, it is not in the factory manual.

I did my truck back in January, due to a dropped valve seat. Check some of my other posts for more info on pulling the heads on this motor.

Good luck,

Mike