Original BMW Crankcase Vent Hose, PCV Valve to Turbo Air Pipe, for BMW M2 Competition, M3, and M4 (2015–2021)

On the S55 engine in the BMW M2 Competition, M3, and M4, this Original BMW crankcase vent hose links the PCV valve in the valve cover to the turbo air pipe. It routes crankcase vapors back into the intake to be burned. You will find it at the back of the intake manifold, toward the firewall. A crankcase vent hose relieves the pressure that builds in an engine as a byproduct of combustion. BMW's name for the part is simply vent hose. This genuine part is made in Austria, sold individually, and has been in production since April 2014.

Original BMW Parts carry a 24-month parts warranty.

Over time, blow-by and oil sludge can clog the PCV system. The individual hoses can also turn brittle and start to leak. A leak in this line lets in unmetered air. That can set a check engine light for an intake air leak or cause a misfire. Plastic connectors on the hose can break during removal, so inspect the clips whenever the intake area is disturbed. This hose carries only the valve cover to turbo pipe connection. BMW does not show a superseded number for it.

Technical Details

• Manufacturer: BMW (genuine part)
• Part number: 11-12-7-850-244
• BMW part name: vent hose
• Connects: valve cover PCV valve to turbo air pipe
• Location: rear of intake manifold, firewall side
• Engine: S55
• Production start: April 2014
• Made in Austria, sold individually
• Warranty: 24-month parts warranty

Common Questions

Where is this hose on the engine?
It sits at the back of the intake manifold toward the firewall. It runs from the PCV valve in the valve cover to the turbo air pipe.

Does it fit the M4 convertible?
Yes. BMW applies it to the F83 M4 convertible as well as the F82 coupe.

What happens if this hose leaks?
A leak lets unmetered air into the intake. That can trigger a check engine light, cause rough running or a misfire, and leave oil residue around the hose.

Fitment & Compatibility

Use the fitment table below to confirm year, model, submodel, and application notes before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.