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Compare 2 brands — check fitment and order online
OE part number 8D0121403K is a Coolant expansion tank compatible with AUDI, SKODA and other makes. Available from 2 brands, priced from £34.99. Every cross-reference listed below matches the same OE specification used by the vehicle manufacturer.
Coolant expansion tank OE 8D0121403K prices range from £34.99 to £66.99, with 2 brands offering compatible parts.
Original installation position for OE 8D0121403K. The red ring marks where this part installs on the vehicle.

OEM workshop diagram — sourced from manufacturer parts catalogue.
OE 8D0121403K is compatible with the following make/model combinations:
| Make | Models |
|---|---|
| AUDI | A6 C5 (4B2, 4B4), A6 C5 Avant (4B5, 4B6), A4 B5 (8D2), A4 B5 Avant (8D5) |
| VW | PASSAT B5 (3B2), PASSAT B5 Variant (3B5), CRAFTER 30-50 Platform/Chassis (2F), CRAFTER 30-50 Van (2E) +1 |
| SKODA | SUPERB I (3U4) |
Choose a brand to see their compatible parts for OE 8D0121403K.
Products matched to OE number 8D0121403K.
| 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 |
Common original equipment numbers linked to stocked alternatives.
OE (Original Equipment) number 8D0121403K 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 2 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 8D0121403K.