Audi A8 fault code 000568 3.0 2008 tdi manifold pressure/boost sensor (G31) location?

bilal-audi-786

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Hi everyone I'm new to this form so any help would be appreciated.

I have an Audi A8 3.0 2008 Quattro tdi the car is in limp mode max speed around 40mph, I have plugged in my vagcom 15.7.1 diagnostics and have the following fault code 000568 manifold pressure/boost sensor (G31) signal too high seems like and electrical fault as it comes back straight away without the need to start the engine when ignition is turned on.

could anyone please tell me where this is located im sure this will be same as other 3.0 tdi Quattro Audis and maybe even other audis I need to find this sensor so I can give it a clean and see if it sort out the problem or replace it.
I also have a problem with glowplug in cylinder 3 faultcode 005660 it says open circuit but I don't think that would cause the car to go in limp mode.

As I stated earlier any help would be appreciated.

Many Thanks.