Can someone please give location for ( control module all wheel drive clutch) on a 2017 superb diesel 4x4, car lights up like Xmas tree and it’s fault num 1 on vcds system. Hoped it was speed sensor but not that lucky, is it big job to replace/code in, any help appreciated.

You haven't actually told us what the fault code is?

 

The control module is bolted to the rear diff. It does need coding and adapting to work correctly yes.