Help needed where is this vaccum pipe going?

[X5E53John]

Hi. Im new to this forum and owning my E53 3.0 petrol
The car has been running great lately.
But suddenly the car went in to limp mode the morning after a long drive.
With the trifecta lights coming on with EML light.
I had the codes read and it came up with P1632
Had the code cleared and run great again hour or two later same thing happened ive researched it and all i could find related to the ICV so i removed this and cleaned it out it wasnt that dirty to be honest and seemed to move freely anyway.
Put it all back together and she has been running great the last couple days.
However i noticed theres two pipes near each other that aren’t connected to anything one attached to the oil filler which i have researched and believe is a vent to the gearbox but the other pipe is a vaccum pipe as when running it is drawing in air. The pipe is located to the right of the DSV valve and i believe it has a fuel line going in to y junction.
Thanks