rookie here, i have no ideea what line is the one marked with red , i add 2 image with an 2.8 a6 01, and i think the line comes from rear side of the engine and goes under the power output stage. the car runs good , didn`t give me any codes so far , but i assume i have a small leak on this line and i plan to replace it , but i have to know first what line it is and what it does

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I believe thats a power steering line. Just go to the dealer and point out that line on ETKA, and it will pop up on his screen what it is.