Buenas
Sin tener certeza total, creo que puede ser la tubería de purgado de aceite que va al tapòn.
13 71 140Replacing intake pipe between hot film air mass meter and exhaust turbocharger (N47, N47S)
Necessary preliminary tasks:
Unfasten clamp.
Unclamp lines from intake pipe.
Pull the intake pipe off the hot film air mass meter.
Installation note:
Make sure intake pipe (2) is correctly seated on hot film air mass meter.
Release screw.
Detach line for oil venting.
Unlock clasp and remove air pipe.Installation note:
Clasp must be clearly heard to snap into place.
N47S only:
Note installation position and condition of swirl generator (1).
Reassemble the vehicle.