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Number 31 marks the part’s position in this exploded view (Audi A5 Limousine (2024-2025)).
Other diagrams in the gallery may use a different number for the same part.
Product overview
Genuine OEM Audi Cap for Expansion Tank, part number 8B3121321. Fits Audi A5 Avant (2024-2025), Audi A5 Limousine (2024-2025), Audi Q6 e-tron (2023-2025), Audi Q8 e-tron (2018-2025). Shown as position 31 in the engine diagram 8WK121090.
Catalogue entry: cap for expansion tank.
Technical details
- Category
- Engine Cooling
- Diagram sheet
- Audi 8wk121090, position 31
- ETKA group
- 1 / 21 (121)
- Manufacturer
- Audi
- Product Type
- Genuine new auto parts
Specifications
As recorded in the manufacturer’s parts catalogue for this part number.
Equipment codes
- 0K4
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.
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- ✓ Genuine OEM inventory sourced directly from factory networks
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- ✓ Global logistics with customs-ready documentation
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Replaces older part numbers
This is the current manufacturer number. Older numbers on this road are no longer supplied.
- 4KE121321ANot stocked
Mar 2023 - 8B3121321This pageCurrent number
