Audi S6 C6 - Camshaft Position Fault

[Ross87]

I've got 2 faults from my S6 and I'm looking to see if anyone knows where I should start my investigations, what might be the probable cause or if anyone's had a similar issue? Any and all ideas are welcomed.

P000B: "B" Camshaft Position Slow Response (Bank 1) - Implausible Signal
P0011: A Camshaft (Bank 1) Timing over-advanced or System Performance - No signal/communication

Thanks in advance.