11617503520 PCV Membrane for BMW N46, N42
This PCV membrane is designed for BMW N46 and N42 engine applications using OEM reference 11617503520. It replaces the failed diaphragm in the crankcase ventilation / oil separator system and helps restore correct pressure regulation.
This product is the membrane only. It is not a complete oil separator, complete PCV valve, or full crankcase ventilation assembly.
OEM / Reference Numbers
Primary OEM number:
- 11617503520
Secondary OEM / reference numbers:
- 11617516007
- 11617526654
- 11157533336
Product reference:
- SKU: KL11617503520
Part Type
- PCV membrane
- crankcase ventilation diaphragm
- oil separator membrane
- engine breather diaphragm
- BMW N46 / N42 PCV repair component
What This Part Does
The PCV membrane regulates crankcase pressure and controls blow-by gas flow through the crankcase ventilation system. When the diaphragm tears, hardens or loses elasticity, the ventilation system can lose correct pressure control and cause engine operation issues.
Replacing the failed membrane helps restore the function of the existing PCV / oil separator unit while avoiding replacement of the complete assembly when the housing is still serviceable.
Compatible Vehicles
This PCV membrane is listed for BMW N46 and N42 engine applications.
- BMW N46 engine applications
- BMW N42 engine applications
The product page does not provide a detailed chassis or year fitment table. Compatibility should be confirmed by OEM number, engine type and membrane design.
Engine / Engine Family
- BMW N46
- BMW N42
Common Symptoms of Failure
- rough or unstable idle
- whistling or suction noise from the PCV area
- vacuum leak symptoms
- increased oil consumption
- incorrect crankcase pressure
- oil vapor issues in the intake system
- check engine light related to air or mixture faults
Why Choose This Replacement
- Targets the exact repair intent for 11617503520
- Supports related references 11617516007, 11617526654 and 11157533336
- Replaces the failed PCV membrane in the existing ventilation component
- Cost-effective alternative to replacing the complete oil separator or PCV assembly when only the diaphragm has failed
- Helps restore crankcase ventilation and pressure control
Important Before Ordering
- Check that your original crankcase ventilation component matches 11617503520 or one of the listed reference numbers.
- Confirm that your vehicle uses a compatible BMW N46 or N42 engine.
- Compare the membrane shape and size with the diaphragm installed in your original part.
- This product is a PCV membrane only, not a complete oil separator or valve assembly.
- Verify compatibility by OEM number, engine type and part design before ordering.
FAQ
What does BMW 11617503520 fit?
BMW 11617503520 is listed for PCV membrane repair on BMW N46 and N42 engine applications.
Is 11617516007 related to 11617503520?
Yes. 11617516007 is listed as a related reference number for this BMW N46 / N42 PCV membrane application. The main repair focus remains 11617503520.
What does this BMW PCV membrane do?
The membrane regulates crankcase pressure and controls blow-by gas flow through the crankcase ventilation / oil separator system.
What symptoms indicate PCV membrane failure on BMW N46 or N42 engines?
Common symptoms include rough idle, whistling noise, vacuum leak symptoms, increased oil consumption, incorrect crankcase pressure and oil vapor issues.
Is this a complete oil separator or PCV valve?
No. This product is the PCV membrane / diaphragm only. It is not a complete oil separator, complete PCV valve or full crankcase ventilation assembly.
How do I confirm compatibility before ordering?
Confirm OEM number 11617503520 or a listed related reference, check that your engine is BMW N46 or N42, and compare the membrane design with your original diaphragm.
Read All
Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings