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Details
| Specification | Value |
|---|---|
| Brand | FILTRON |
| MPN | am442-9w |
| Height [mm] | 387 mm |
| for article number | AM 442/9 |
| Outer Diameter 1 [mm] | 194 mm |
| Outer Diameter 2 [mm] | 184 mm |
| Inner Diameter 1 [mm] | 172 mm |
OE/OEM numbers (2)
Where this part fits
Original-fit position for OE 21115501. The red ring marks where this part installs on the vehicle.
About this product
The FILTRON Secondary Air Filter (AM 442/9W) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: Height [mm]: 387 mm, for article number: AM 442/9, Filter type: Stainless Steel, Outer Diameter 1 [mm]: 194 mm, Outer Diameter 2 [mm]: 184 mm. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. This part supersedes original equipment references: 105983, 1535004, 21115501, 2.14736 and 28 more. Matching these numbers confirms a like-for-like replacement with no loss of function. FILTRON 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
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Verifying part compatibility — check back shortly.Equivalent products (30)
Show all 30 OE numbers
Secondary Air Filter FILTRON AM 442/9W — compatible car models
| Manufacturer article number (MPN) | AM 442/9W |
|---|---|
| OE part numbers | 21115501, 23294956 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
FILTRON am442-9w . EU General Product Safety Regulation (GPSR): 2. Filter type: 9. for article number: AM 442/9. Height [mm]: 387 mm. Inner Diameter 1 [mm]: 172 mm. Outer Diameter 1 [mm]: 194 mm. Outer Diameter 2 [mm]: 184 mm
- 1x Secondary Air Filter
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 Secondary Air Filter compatible with my car?
Use the vehicle selector at the top of the page to check compatibility. Enter your car's make, model, and engine — we'll confirm whether this Secondary Air Filter fits. All fitment data is verified through TecDoc.
What specifications does this FILTRON Secondary Air Filter have?
This FILTRON Secondary Air Filter has the following specifications: Height [mm]: 387 mm; for article number: AM 442/9; Filter type: 9; Outer Diameter 1 [mm]: 194 mm; Outer Diameter 2 [mm]: 184 mm; Inner Diameter 1 [mm]: 172 mm. Check the full specifications table above for complete details.
What OE part numbers does this Secondary Air Filter replace?
This Secondary Air Filter replaces OE part numbers: 21115501, 23294956. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Secondary Air Filter cost?
This FILTRON Secondary Air Filter is available for £66.99. Secondary Air Filter prices vary depending on brand, specifications, and vehicle compatibility. FILTRON parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Secondary Air Filter?
Regular inspection of your Secondary Air Filter is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Secondary Air Filter?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Secondary Air Filter fitted by a professional mechanic.
Can I use this part as a replacement for OE 21115501?
Yes, this FILTRON Secondary Air Filter is a direct replacement for OE part number 21115501. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Is the FILTRON AM 442/9W the same as the FILTRON AM 401W?
No, while both are Secondary Air Filter parts, they are different products. The FILTRON AM 442/9W has Height [mm]: 387 mm, for article number: AM 442/9, Filter type: 9. The FILTRON AM 401W may differ in dimensions, fitting position, or material composition. Always verify compatibility with your specific vehicle using our vehicle selector, or contact our customer service team for assistance.
