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Number 30 marks the part’s position in this exploded view (Audi RS4 Avant (2017-)).
Other diagrams in the gallery may use a different number for the same part.
Product overview
Genuine OEM Audi expansion tank, part number 8W2121405N. This component serves as the reservoir for engine coolant, allowing for expansion and contraction due to temperature changes. It plays a vital role in maintaining the correct coolant level and pressure within the cooling system, preventing overheating. Constructed from robust plastic, it is designed to withstand the thermal stresses of the engine bay. Genuine OEM parts ensure the correct material composition and structural integrity for reliable cooling system performance.
Catalogue entry: CONTAINER rhd.
Technical details
- Category
- Engine Cooling
- Customs (HS) code
- 87089997
- Manufacturer
- Audi
- Product Type
- Genuine new auto parts
- Shipping size (L × W × H)
- 24.5 × 16.5 × 21 cm
- Shipping weight
- 860 g
Specifications
As recorded in the manufacturer’s parts catalogue for this part number.
Equipment codes
- L0R
PR codes identify the factory option a part belongs to; your vehicle’s are listed on the data sticker in the boot well or service booklet.
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
Replaces older part numbers
This is the current manufacturer number. Older numbers on this road are no longer supplied.
- 8W2121405ENot stocked
Oct 2017 - 8W2121405GNot stocked
Sep 2018 - 8W2121405HNot stocked
Dec 2018 - 8W2121405JNot stocked
Nov 2020 - 8W2121405KNot stocked
May 2021 - 8W2121405NThis pageCurrent number
