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Thanks for choosing Just Answer . I'm Wolfgang here to help!!Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail. Do not rate yet, just reply. Put yourself in my shoes, I can not see, smell, hear, feel or touch your car, nor do I know any history on it. So take into consideration I am doing my best based on what you tell me. Also understand fixing cars often requires sophisticated tools, that you may not own. So even if you can not do what is outlined in my answer, that does not mean my answer is wrong deserving to be rated negative.
first off the the wastegate rod works off of pressure of the turbo. is the vacuum hose from the control valve to the turbo new ? if not please replace the 2-3 foot hose and recheck
do you have VAG COM scan tool?
please let me know
ok do you have vag com scanner ? you have an overboost fault and then goes into limp mode. the vag com scan tool is critical on diagnosis