Anyone know where to get a knock sensor from, and how to change it?

the vag com fault code I am getting is

Controller: 4D0 907 551 F
Component: 2.8L V6/5V MOTR HS D03
Coding: 04201
Shop #: WSC 06335
1 Fault Found:
16716 - Knock Sensor 2 (G66): Signal too Low
P0332 - 35-10 - - - Intermittent
Readiness: N/A



Thanks
Sam