Compare 26 brands — check fitment and order online
OE part number 3B0121321 is a Coolant tank cap compatible with AC, ACURA and other makes. Available from 26 brands, priced from £3.99. Every cross-reference listed below matches the same OE specification used by the vehicle manufacturer.
Coolant tank cap OE 3B0121321 prices range from £3.99 to £18.99, with 26 brands offering compatible parts.
Original installation position for OE 3B0121321. The red ring marks where this part installs on the vehicle.
OEM workshop diagram — sourced from manufacturer parts catalogue.
OE 3B0121321 is compatible with the following make/model combinations:
| Make | Models |
|---|---|
| AUDI | A4 B8 (8K2), A4 B8 Avant (8K5), A5 (8T3), A4 B7 (8EC) +4 |
| SKODA | OCTAVIA II Combi (1Z5) |
| VW | GOLF V (1K1) |
Choose a brand to see their compatible parts for OE 3B0121321.
Products matched to OE number 3B0121321.
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Aftermarket manufacturers cross-reference matching coolant expansion tank and cap, radiator to OE 3B0121321 — verify fitment before ordering.
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| Attribute | Value |
|---|---|
| Supplementary Article/Supplementary Info | 35 |
| Pressure [bar] | 2 |
| Thread Size 1 | M3 |
| Diameter [mm] | 45 |
| Height [mm] | 18 |
| Height [mm] | 31 |
| Height [mm] | 33 |
| Height [mm] | 34 |
| Inner Diameter [mm] | 29 |
| Material | 4 |
Common original equipment numbers linked to stocked alternatives.
OE (Original Equipment) number 3B0121321 is a manufacturer's reference code for Coolant tank cap used to identify the exact specification of a part fitted during vehicle production. By cross-referencing this OE number, you can find 26 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 3B0121321.