In stock
Original equipment number
Coolant expansion tank, OE 4F0121403B. 12 compatible equivalents from 11 brands, 10 of them in stock. Prices from £13.99 to £72.99. Fits AUDI, AUDI (FAW).
TOPRAN 113 615£21.99
CALORSTAT by Vernet ET0054C1£24.99
ABAKUS 003-026-001£15.99
Manufacturers list each of these parts against OE 4F0121403B. The cheapest ones in stock come first; the full list follows, sorted by price.
UK delivery £5.99, free over £50 · We also ship from the EU to 200 countries, with no customs charges within the EU — see prices and times
Your car
Choose your car and we will mark the parts that fit it.
In stock
In stock
In stock
In stock
In stock
In stock
In stock
In stock
10 in stock now, 2 not in stock right now. Sorted by price.
| Brand | Number | EAN | Features | Price | Availability |
|---|---|---|---|---|---|
| ABAKUS | 003-026-001 | — | 288 | £15.99 | In stock |
| TOPRAN | 113 615 | — | 24 · 39 · 1 · 14 | £21.99 | In stock |
| CALORSTAT by Vernet | ET0054C1 | 3531650044207 | 1,4 bar · 896 · 567 | £24.99 | In stock |
| vika | 11210377601 | 6936397406436 | 0,765 kg · 1 · 6 | £25.99 | In stock |
| vika | 11211838101 | 6923570483384 | — | £32.99 | In stock |
| Metalcaucho | 03973 | 8435108497667 | 0,91 kg · 1 · 6 · 14 | £34.99 | In stock |
| FEBI BILSTEIN | 44531 | 4027816445319 | 4F0 121 403 M · 0,765 kg · 6 · 896 | £36.99 | In stock |
| THERMOTEC | DBW023TT | 5901655270877 | 32,0 cm · 23,00 cm · 21,50 cm · 978,0 g | £38.99 | In stock |
| NRF | 454007 | 8718042317728 | 313 mm · 220 mm · 212 mm · 1 | £40.99 | In stock |
| NISSENS | 996292 | 5707286506329 | 1,6 l · 6 · 896 · 287 | £72.99 | In stock |
| Brand | Number | EAN | Features | Price | Availability |
|---|---|---|---|---|---|
| NTY | CZW-AU-015 | 5902048352279 | CZW-AU-015 | £13.99 | Out of stock |
| MAHLE | CRT 81 001S | 4057635115575 | 267,0 mm · 189 mm · 251,0 mm · 7 | £33.99 | Out of stock |
OE 4F0121403B is compatible with the following make/model combinations:
Choose a brand to see their compatible parts for OE 4F0121403B.
OE part number 4F0121403B is a Coolant expansion tank compatible with AUDI, AUDI (FAW) and other makes. Available from 11 brands, priced from £13.99. Every cross-reference listed below matches the same OE specification used by the vehicle manufacturer.
Coolant expansion tank OE 4F0121403B prices range from £13.99 to £72.99, with 11 brands offering compatible parts.
OE (Original Equipment) number 4F0121403B is a manufacturer's reference code for Coolant expansion tank used to identify the exact specification of a part fitted during vehicle production. By cross-referencing this OE number, you can find 11 compatible aftermarket brands that match the same specification — often at a lower price than the original. All parts listed above are verified to match OE 4F0121403B.
Original installation position for OE 4F0121403B. The red ring marks where this part installs on the vehicle.

OEM workshop diagram — sourced from manufacturer parts catalogue.
| Attribute | Value |
|---|---|
| Forward- /Backflow | 1 |
| Supplementary Article/Info 2 | 14 |
| Fitting Position | Engine Compartment |
| Additionally required articles (article numbers) | CRB 99 000S |
| Additionally required articles (article numbers) | FC516 |
| Additionally required articles (article numbers) | WG2184255 |
| Article number of recommended accessories | 2140047 |
| Capacity [litre] | 10,5 |
| Capacity [litre] | 11,4 |
| Capacity [litre] | 1,9 |
Other original equipment numbers linked to 4F0121403B. Each one leads to its own fitment and price page.
Only vehicle manufacturers' numbers are listed here. Other makers' equivalents are under “Compatible parts”.
Common original equipment numbers linked to replacement-part pages.
4–8 days
Standard delivery £5.99. Free on orders from £50.00.
£50.00
On every order from £50.00.
14 days
Changed your mind? Send unused parts back within 14 days of delivery.
We accept PayPal, Visa and Mastercard.
OE 4F0121403B fits vehicles from AUDI, AUDI (FAW) and other compatible models listed below.
OE 4F0121403B is an original equipment reference for a Coolant expansion tank. It identifies the exact part specification used by the vehicle manufacturer.
Replacement parts for OE 4F0121403B cost between £13.99 and £72.99, depending on brand and specification.
vika, ABAKUS, TOPRAN, CALORSTAT by Vernet, Metalcaucho all offer compatible replacements for OE 4F0121403B.
OE 4F0121403B is an original equipment reference assigned by the vehicle manufacturer. The parts listed below are quality-matched aftermarket and OEM-equivalent replacements that meet the same specification.