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Details
| Specification | Value |
|---|---|
| Brand | BREMSI |
| MPN | fc1921 |
| Category | Filter, interior air |
| Length [mm] | 345 mm |
| Width [mm] | 213 mm |
| Height [mm] | 20 mm |
OE/OEM numbers (4)
Where this part fits
Original-fit position for OE 4A1820367. The red ring marks where this part installs on the vehicle.
About this product
Sourced from BREMSI, this filter, interior air (FC1921) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Length [mm]: 345 mm, Width [mm]: 213 mm, Height [mm]: 20 mm, Filter type: 21 — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit AUDI models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 1420, 1987432033, 2352F, 352F and 31 more. Matching these numbers confirms a like-for-like replacement with no loss of function. BREMSI is a recognised supplier of automotive filtration components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.
Suitable cars
Equivalent products (31)
Show all 31 OE numbers
Filter, interior air BREMSI FC1921 — compatible car models
| Car models | AUDI: A6 C4 (4A2), A6 C4 Avant (4A5) |
|---|---|
| Engines | 1.8 |
| Year of manufacture | 1994-1998 |
| Manufacturer article number (MPN) | FC1921 |
| OE part numbers | 4A0091800, 4A1820367, 4A1823670, CAF16 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
BREMSI fc1921 Filter, interior air. Filter type: 21. Height [mm]: 20 mm. Length [mm]: 345 mm. Width [mm]: 213 mm
- 1x Filter, interior air
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Express and standard shipping available.
- Standard delivery: 2-5 business days
- Express delivery: 1-2 business days
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Filter, interior air compatible with my car?
This Filter, interior air fits AUDI vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this BREMSI Filter, interior air have?
This BREMSI Filter, interior air has the following specifications: Length [mm]: 345 mm; Width [mm]: 213 mm; Height [mm]: 20 mm; Filter type: 21. Check the full specifications table above for complete details.
What OE part numbers does this Filter, interior air replace?
This Filter, interior air replaces OE part numbers: 4A0091800, 4A1820367, 4A1823670, CAF16. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Filter, interior air cost?
This BREMSI Filter, interior air is available for £10.99. Filter, interior air prices vary depending on brand, specifications, and vehicle compatibility. BREMSI parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Filter, interior air?
Replace when you notice reduced airflow from the HVAC system, persistent musty odours, increased noise when the fan is running, or fogging windows. Most cabin filters should be changed every 15,000-25,000 miles.
What tools do I need to replace a Filter, interior air?
Tools needed: flat-head screwdriver or 8mm socket may be required to remove the glove box (location and access varies by model -- check the vehicle handbook). Difficulty: Easy DIY. Safety warning: Wear a dust mask when removing a heavily contaminated cabin filter -- it traps fine particulates, allergens, and bacteria.
Can I use this part as a replacement for OE 4A0091800?
Yes, this BREMSI Filter, interior air is a direct replacement for OE part number 4A0091800. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
