Did the code come back that it sensed a knock or that the knock sensor is bad? Do you remember the code? It will, more than likely, begin with a "P". Maybe P0325, P0327, etc. My knock sensor actually went bad, but I can't remember the code that it was throwing right now. If you have to replace it, the knock sensor is a bit of a bear to get to as it is buried beneath the intake manifold in the well between the cylinder banks.
I took some pictures when I replace my knock sensor, so if you get to the point of needing to replace it I can post them up if you think they would help.
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