VCDS will be able to do an output test and adaptation to ensure the little manifold flap motor is working etc, but these normally fail because as they wear out the flap moves too far and then gets stuck. The “fix” is to install that metal bracket which stops the flap from being able to move past the point of no return.
I very much doubt you will be able to fix this code for good without installing the part. Im happy to clear the code for you but no doubt it will come back.
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