Original BMW Crankcase Vent Hose for N55 BMW 1, 3, 5, and 6 Series, X1, X3, X4, X5, and X6 (2010–2019)

On N55-powered BMWs from the 135i to the X6, this Original BMW vent hose carries crankcase gases from the valve cover into the crankcase ventilation and oil separator system. BMW calls the part "Vent hose," and production of this number started in September 2009. It is made in Austria and sold as a single piece. Every engine leaks some combustion gas past the piston rings. The vent hose gives that blow-by a route back to the intake so it does not pressurize the crankcase.

Original BMW Parts carry a 24-month parts warranty.

This hose belongs only to the N55 six-cylinder. That narrow engine match explains why it appears in so many different body shapes. The hose works in constant oil vapor, heat, and crankcase pressure, which makes it a common failure point in the ventilation system. Oil slowly breaks down plastic and rubber, connectors become brittle and can snap during other service work, and the hose body can split. Unmetered air from a leak can set a check engine light for an intake leak or an airflow fault. A severe leak can also cause rough running and a misfire. Oily residue and moisture on the hose and the engine around it are another sign, and you may smell burning oil in bad cases.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-12-7-584-128
• BMW part name: Vent hose
• Engine: N55
• Production start: September 2009
• Country of manufacture: Austria
• Sold as: one piece
• Warranty: 24 months on Original BMW Parts

Common Questions

Where does this hose connect?
It comes off the valve cover and is part of the crankcase ventilation and oil separator system on the N55.

Can a cracked vent hose set a check engine light?
Yes. Unmetered air from a leaking hose can set an intake leak or airflow fault. A severe leak can also cause a misfire.

Fitment & Compatibility

Use the table below to verify the year and submodel for your build. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.