United States
Product overview
Genuine OEM Audi expansion tank, part number 4F0121403N. This part functions as the reservoir for engine coolant, allowing for expansion and contraction of the fluid due to temperature changes. It is typically located in the engine bay, connected to the radiator and cooling system hoses. Made of durable plastic, it is designed to withstand engine temperatures and pressures. Genuine OEM parts ensure exact fit and material integrity for reliable cooling system performance.
Technical details
- Category
- Engine Cooling
- Country of origin
- Italy
- Customs (HS) code
- 87089997
- Manufacturer
- Audi
- Product Type
- Genuine new auto parts
- Shipping size (L × W × H)
- 31 × 22 × 20.5 cm
- Shipping weight
- 0.73 kg
Why buy from WW Spares?
- ✓ Genuine OEM inventory sourced directly from factory networks
- ✓ Fitment support from workshop-seasoned parts specialists
- ✓ Global logistics with customs-ready documentation
Need help confirming compatibility? Talk to a specialist
Parts diagram & fitment
4 vehiclesReservoir — locate 4F0121403N Audi Expansion Tank | Genuine OEM in the official exploded view and explore the surrounding assembly.
Superseded by 8E0121321 — the current replacement part.
Parts in this assembly20
- 1Radiator 4F0121251Q
- 1Radiator 4F0121251L
- 1Radiator 4F0121251M
- 1Radiator 4F0121251R
- 1Radiator 4F0121251T
- 1Radiator 4F0121251AA
- 1Radiator 4F0121251AE
- 1Radiator 4F0121251AF
- 2Part 8D0121200
- 3Rubber Bush 4F0121276
- 4Rubber Bush 8D0121275
- 10Container 4F0121403M
- 11Bolt N91090701
- 12Part 811807577C
- 13Grommet 431129669
- 14Cover 8E0121321
- 15Seal Ring 1H0121687A
- 20Cool Add G012A8FM8
- 20Cool Add G012A8FM9
- 20Coolant Ad G012A8GA3
Compatible / alternative parts(1)
Vehicle fitment table4
Europe (3)
| Vehicle | Years | Pos. | Qty | Remark | PR |
|---|---|---|---|---|---|
| Audi A6 2.7 TDI | 2008-2011 | 10 | 1 | TA1 | |
| AUDI A6 QU.ALLROAD 07> | 2006- | 10 | 1 | CA | |
| Audi A6/S6/Avant/qu. 05> | 2004- | 10 | 1 | BLB | ,BN |
Other markets (1)
| Vehicle | Years | Pos. | Qty | Remark | PR |
|---|---|---|---|---|---|
| AUDI A6L "CN"05> | 2005- | 10 | 1 |
Diagrams & fitment data powered by oemdiagrams.com
4F0121403N Audi Expansion Tank | Genuine OEM is fitted on: Audi A6 2.7 TDI 2008-2011; AUDI A6 QU.ALLROAD 07> 2006-; Audi A6/S6/Avant/qu. 05> 2004-; AUDI A6L "CN"05> 2005-.
