Audi R8/RS5 Coolant Reservoir / Tank / Bottle Cap 4B3121321
OEM Part #: 4B3-121-321 (4B3121321)
This page covers one exact OEM part number. Every unit we stocked has sold.
We may be able to get another
Used OEM parts are one-of-a-kind. We sometimes get another when we dismantle a matching vehicle, but we can’t say when — browse what’s in stock now:
Other Coolant Reservoir / Tank that may fit your vehicle
- Genuine OEM — real photos
- 30-day returns on eligible parts
- eBay Top Rated · 100,000+ positive ratings
- Ships from our own indoor warehouse
Specifications
| Fits Vehicle Model | R8, RS5 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4B3-121-321 (4B3121321) |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 15 vehicle configurations across 1 make, 2011-2015.
Check your specific vehicle before ordering.
This list shows year, make, and model. Some years have multiple trims or
engines that use different parts, and individual listings may have
additional fitment notes (e.g. “with sunroof only”). Review
the full variant list below, or
message us with your VIN
and we’ll confirm the match.
View all 15 vehicle configurations — 5 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2011 | Audi | R8 | Spyder Convertible | 4.2L V8 | For Vehicles with Engine Code(s) BYH |
| 2011 | Audi | R8 | Spyder Convertible | 5.2L V10 | For Vehicles with Engine Code(s) BUJ |
| 2012 | Audi | R8 | GT Spyder Convertible | 5.2L V10 | For Vehicles with Engine Code(s) BUJ |
| 2012 | Audi | R8 | Spyder Convertible | 4.2L V8 | For Vehicles with Engine Code(s) BYH |
| 2012 | Audi | R8 | Spyder Convertible | 5.2L V10 | For Vehicles with Engine Code(s) BUJ |
| 2013 | Audi | RS5 | Convertible | 4.2L V8 | |
| 2013 | Audi | RS5 | Coupe | 4.2L V8 | |
| 2014 | Audi | R8 | Spyder Convertible | 4.2L V8 | |
| 2014 | Audi | R8 | Spyder Convertible | 5.2L V10 | |
| 2014 | Audi | RS5 | Coupe | 4.2L V8 | |
| 2014 | Audi | RS5 | Convertible | 4.2L V8 | |
| 2015 | Audi | R8 | Spyder Convertible | 4.2L V8 | |
| 2015 | Audi | R8 | Spyder Convertible | 5.2L V10 | |
| 2015 | Audi | RS5 | Coupe | 4.2L V8 | |
| 2015 | Audi | RS5 | Convertible | 4.2L V8 |