Knock sensor is located on side of engine block screwed into a block coolant drain, your best access is from underneath the vehicle. Coolant will run out when you unscrew it so be sure the engine is cool. Just unplug the wire unscrew the sensor, screw in the new one and plug the wire back in. Also be sure to top off the radiator if you loose any coolant.
There are some model yukon engines ( big V 8's) that have the Knock sensor(s) 2 that are under the intake manafold. the one that goes bad in those type of enines is the front one. Must remove the intake manafold (ouch)
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