Hi weird one, had the 2017 Q30 1.5 dcti serviced just over a month ago, and just opened the bonnet, there is a vertical pipe at the front R-H side of the engine that is just open to the air. I'm sure there used to be something there previously, but not 100% sure. Its not the oil dipstick as that is built into the filler cap. Someone suggested it may be to check the automatic transmission fluid but i have no idea as there is nothing in the manual for it. I have attached a pictures I've taken showing the pipe.
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