353102176 / 046198475B / 046103527A Crankcase Ventilation Membrane for Audi VW Skoda 2.5 TDI
The 353102176 / 046198475B / 046103527A crankcase ventilation membrane is a replacement PCV diaphragm for selected Audi, Volkswagen and Skoda 2.5 TDI applications. This 84 mm membrane is designed to restore the function of the existing crankcase ventilation unit without replacing the complete assembly.
This product is a membrane / diaphragm only. It is intended for targeted repair of the original ventilation unit and should not be treated as a complete valve cover, complete oil separator or full breather assembly.
OEM / Reference Numbers
Primary OEM: 353102176, 046198475B, 046103527A
Related / Reference Numbers: No additional reference numbers are explicitly confirmed for this product.
Part Type
- Crankcase ventilation membrane
- PCV diaphragm
- Breather membrane
- 2.5 TDI ventilation diaphragm
What This Part Does
This membrane works inside the crankcase ventilation system. It helps the breather unit regulate pressure and maintain correct operation. When the original diaphragm becomes damaged, the ventilation system can lose sealing ability and may create pressure imbalance in the engine crankcase.
Compatible Vehicles
- Audi 100
- Audi A4
- Skoda Superb
- Volkswagen Passat
Please verify OEM number, engine type and crankcase ventilation unit design before ordering.
Engine / Engine Family / Technical Detail
- Engine focus: 2.5 TDI
- Membrane diameter: 84 mm
- Part format: membrane / diaphragm only
Common Symptoms of Failure
- Whistling noise from the crankcase ventilation area
- Oil leak symptoms caused by pressure imbalance
- Unstable idle
- Increased oil consumption
- Vacuum leak symptoms
Why Choose This Replacement
- Targets exact OEM intent for 353102176, 046198475B and 046103527A
- Supports repair of the existing crankcase ventilation unit
- Cost-effective alternative to replacing the full unit
- Designed for the correct 84 mm diaphragm repair type
Important Before Ordering
- Verify OEM 353102176, 046198475B or 046103527A against your original part
- Confirm your 2.5 TDI application
- Check the 84 mm membrane diameter
- Make sure you need the membrane only, not a complete ventilation assembly
What does 353102176 / 046198475B / 046103527A fit?
These numbers are used for selected Audi, Volkswagen and Skoda 2.5 TDI crankcase ventilation applications, including Audi 100, Audi A4, Skoda Superb and Volkswagen Passat model groups.
Is 046198475B the same type of part as 046103527A?
Yes. 046198475B and 046103527A are primary references for the same crankcase ventilation membrane application group.
What does this crankcase ventilation membrane do?
It helps the crankcase ventilation system regulate pressure and maintain sealing inside the existing breather unit.
What symptoms can indicate diaphragm failure?
Possible signs include whistling noise, pressure imbalance, oil leak symptoms, unstable idle, increased oil consumption or vacuum leak behavior.
Is this a complete ventilation assembly or membrane only?
This product is a membrane / diaphragm only. It is intended to repair the existing crankcase ventilation unit.
How do I confirm compatibility before ordering?
Match OEM 353102176, 046198475B or 046103527A with your original part and confirm your 2.5 TDI engine, housing design and 84 mm membrane size.
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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