Original BMW Crankcase Vent Hose for BMW 2002tii M10 (1971–1974)

On the fuel-injected BMW 2002tii, this Original BMW vent hose is part of the crankcase ventilation system, routing blow-by gas from the M10 engine's crankcase so it can be burned as part of the intake charge. Pressure that builds inside the crankcase can push past seals and cause them to fail, which is why the ventilation path matters. BMW calls the part a vent hose and shows production starting in January 1970. It weighs 103 grams. This Original BMW hose is made in Switzerland.

Original BMW Parts carry a 24-month parts warranty.

BMW assigns this hose to the 2000tii and 2002tii M10 under the 114 and NK model groups. Breather hoses live with heat, oil vapor, and pressure, so they age, and a cracked, split, or broken hose lets unmetered air into the system. Hoses and valves in this system wear with age and should be replaced when they fail. A genuine BMW part carries the BMW roundel and a short seven-digit part number, here 1252665.

Technical Details

• Manufacturer: BMW
• Part number: 11-15-1-252-665
• BMW part name: vent hose
• System: crankcase ventilation
• Engine: M10, tii fuel injection
• Weight: 103 g
• Production from January 1970
• Made in Switzerland
• Sold individually
• Warranty: Original BMW Parts carry 24 months of coverage

Common Questions

What happens when this hose cracks?
A cracked or broken breather hose lets unmetered air and oil vapor escape the ventilation path, and it can also lead to leaks.

How can I tell this is a genuine BMW part?
Genuine BMW parts carry a BMW roundel stamp and a short seven-digit part number.

Fitment & Compatibility

Compare your production year and trim against the table below. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.