United States
Product overview
Genuine OEM Audi Coolant Expansion Tank, part number 4K0121405AB. This vital component holds excess engine coolant, allowing for thermal expansion and contraction within the cooling system. It helps maintain proper system pressure and fluid levels, preventing overheating and damage. Constructed from durable, heat-resistant plastic, this reservoir weighs approximately 1.01 kg. Choosing a genuine OEM expansion tank ensures precise fitment, correct fluid capacity, and material integrity to withstand engine bay temperatures and coolant chemistry over time.
Catalogue entry: CONTAINER.
Technical details
- Category
- Engine Cooling
- Country of origin
- Germany
- Customs (HS) code
- 87089997
- Manufacturer
- Audi
- Product Type
- Genuine new auto parts
- Shipping size (L × W × H)
- 29 × 18 × 23.5 cm
- Shipping weight
- 1.01 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
3 vehiclesReservoir — locate 4K0121405AB Audi Coolant Expansion Tank | Genuine OEM in the official exploded view and explore the surrounding assembly.
Parts in this assembly11
Vehicle fitment table3
Europe (2)
| Vehicle | Years | Pos. | Qty |
|---|---|---|---|
| audi a6 2.0 | 2018- | 10, 15 | 1 |
| Audi A7 Sportback | 2018- | 10, 15 | 1 |
Other markets (1)
| Vehicle | Years | Pos. | Qty |
|---|---|---|---|
| Audi A7 | 2021- | 10 | 1 |
Diagrams & fitment data powered by oemdiagrams.com
4K0121405AB Audi Coolant Expansion Tank | Genuine OEM is fitted on: audi a6 2.0 2018-; Audi A7 Sportback 2018-; Audi A7 2021-.
