any guides on replacing knock sensor on a wrx bugeye, fault code keeps coming up,

 

its under your inlet manifold pretty much central, and is secured by a single bolt, looks a little like a doughnut with plug connector going to it, simply unbolt, remove plug connector, swap for new one and bolt back up, just dont overtighten it.

 

Here is the link to a write up about your knock sensor change. http://www.uklegacy.com/forums/index...l=KNOCK+SENSOR.
I know its from a legacy but shouldnt be much different, Hope this helps