i was under the car yesterday changing over a bung inner cv and had a tried to find the knock sensor, crickey tighter than a nuns c*nt up there.
Turns out something in gearbox is amiss, suspect its the diff thats playing up as its been whineing for long time, ~2 years, occasionally clunks around like crazy through all the gears.
Im not goign to bother playing around with the knock sensor until i decide what to do about the gearbox problem