UPDATE. Just a bit of info. These sensors seem to be a common problem, if your getting this same fault code then I'd look at these first.
I'm sure it was just the one sensor that was faulty but I replaced both just to save any hassle in future.
(Not saying this is going to be the cause on all occasions but it's certainly the cheaper option)
I got both genuine VWAG sensors for £65 on Ebay 🙂 compared with Audi wanted £72 each.
Also managed to get the adaption done in VCDS by going in to Engine then Basic Settings and there's a drop down menu in there.
Hope this helps anyone with same problem.