PCV Membrane – BMW N46 / N42 | OEM 11617503520

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

• BMW

Returns and exchanges

Request a change-of-mind return within 14 calendar days of delivery, then send the goods within 14 calendar days of notifying us. Our voluntary return option applies to unused, uninstalled, complete goods in their original condition and packaging. Exchanges are subject to availability and agreement.

The customer pays change-of-mind return shipping. No restocking fee applies. Refunds and original delivery charges are handled under our Refund & Return Policy and applicable law.

Faulty, damaged or incorrect goods

Email contact-us@klifex.net with your order details and a description of the problem. These claims are separate from change-of-mind returns. Where we are responsible, we bear the required remedy and return costs. Installation alone does not remove mandatory defect rights.

Your legal rights

Applicable statutory rights take precedence, including EU/EEA and UK withdrawal rights and legal guarantees. Necessary inspection does not remove a statutory withdrawal right; deductions for excessive handling must reflect an actual, evidenced loss of value.

Contact us for the correct return address before shipping. Our legal address is not a return address.

Read the full Refund & Return Policy