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Where is the 'knock sensor' located on an vauxhaul astra 2.0lt 2001 located?

I have recently overhauled my ASTRA DOHC motor and I can not remember where the 'knock sensor' is mounted! If anybody could help me on this I would appreciate it as I am in Zimbabwe with no workshop manual! Many thanks, Liam
Liam, November 2011
Under inlet manifold on the block by #2 cylinder

nigel, November 2011
link Click here to see other fixes for Astra.