[V6-12v] Knock Sensor

[Joe McLafferty]

Hello,

When I get my engine up near 4000 RPM, the engine check light usualy comes on.
After reading another post on here, I checked to see if it was the intake 
manifold changeover valve, but it was functioning properly.
I pulled the code, and it was 2144, refrencing to Knock Sensor #2. Anyone seen 
this code before? How should I go about testing the sensor, and where is the
sensor located?

Thanks, 

-Joe