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Knocking noise could be the exhaust hitting the subframe.
Common issue I think most will agree.
I had a similar issue and had all the mounts checked out by Mike @ Rentech.
It's a button you press in on the righthand stalk.
If you own a Mk1 172 it's not the one that's the horn.
As I found sat in a traffic jam months back LOL
Spray a little bit of sillicon lube up there first.
Could be the bearings... I just replaced the tensioner one and it removed an annoying whine I've had for nearly a year!