Have reached wit's end on it. No mention in RealOEM that we can find, nothing in AllData, not one mention in 100+ posts about intake manifold removal.
Never saw it when I pulled the intake up, so a little plastic L connector sheared off in the back where I circled by the firewall, the other hose is slightly larger. I am going to try to replace with something from a HW store, or even aquarium store if I can't find the BMW replacement.
Checked Fuel, Tranny, Transfer, even heating, cooling. You can see the nipple up by the throttle body and MAF in diagrams, but no mention of the hose or what it connects to.
Compliments to
mysweetx5 for the pic.