A6 C7 2017 Boost pressure sensor

Leifac

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Hi,

Looking for abit of help if possible, over the last few days my 2017 2.0 TDI A6 Avant C7 has been going into limp mode...... with this It is also displaying the EML and emissions light (or glowplug lights).

I called audi who sent the AA out, they plugged in the diagnostic machine and it displayed the codes:
P023600 (Boost pressure sensor signal improbable)
U111300 (Function restriction due to fault valve received) x2
P023700 (Boost pressure sensor signal too low)

Now I have read online that these are pretty simple to replace and cheap aswell (I am worried about dealership and labor prices) however I cant find anywhere that would point me into the right direction of actually finding the sensors ? does anyone have a video or diagram showing where the sensor is located ?

Thank you!