2017-2024 Audi S4/S5 Coolant Breather Line / Tube 8W1121081AK
OEM Part #: 8W1-121-081-AK (8W1121081AK)
Actual photo
The exact part you’ll receive — not a stock photo.
$13.71
Used
Donor2019 Audi S5 · 3.0L
✓ Free Same Day Shipping on orders by noon CT
3 Available — Select Your Part:
Genuine OEM Used
SKU: 699957
Donor Vehicle: 2019 Audi S5 · 3.0L
2 photos
$13.71
30-Day Returns
Genuine OEM Used
SKU: 555995
Donor Vehicle: 2018 Audi S5 SPORTBACK · 3.0L · 59k miles
2 photos
$13.71
30-Day Returns
Genuine OEM Used
SKU: 543099
Donor Vehicle: 2018 Audi S4 · 3.0L · 63k miles
2 photos
$13.71
30-Day Returns
- Genuine OEM — real photos
- 30-day returns on eligible parts
- eBay Top Rated · 100,000+ positive ratings
- Ships from our own indoor warehouse
This Audi coolant breather line (OEM 8W1121081AK) is a genuine used part removed from a donor vehicle. Also called a coolant breather tube, it routes coolant back to the reservoir to maintain proper pressure in the cooling system. Designed for the 3.0L V6 (supercharged or turbocharged) in Audi S4, S5, and S5 Sportback models. When this plastic line cracks, it can cause coolant loss, overheating, or visible steam from the engine bay.
Specifications
| Fits Vehicle Model | S4, S5 |
| Fits Vehicle Make | Audi |
| OEM Part No | 8W1-121-081-AK (8W1121081AK) |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 30 vehicle configurations across 1 make, 2017-2024.
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 30 vehicle configurations
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2024 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2022 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2024 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2023 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2024 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2024 | Audi | S5 | Hatchback | 3.0L V6 Turbo | |
| 2021 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2023 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2022 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2023 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2022 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2021 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2019 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2020 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2019 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2019 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2021 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2020 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2020 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2018 | Audi | S5 | Coupe | 3.0L V6 Turbo | |
| 2018 | Audi | S5 | Convertible | 3.0L V6 Turbo | |
| 2018 | Audi | S4 | Sedan | 3.0L V6 Turbo | |
| 2017 | Audi | S5 | Coupe | 3.0L V6 Supercharged | |
| 2017 | Audi | S5 | Convertible | 3.0L V6 Supercharged | |
| 2023 | Audi | S5 | Hatchback | 3.0L V6 Turbo | |
| 2022 | Audi | S5 | Hatchback | 3.0L V6 Turbo | |
| 2021 | Audi | S5 | Hatchback | 3.0L V6 Turbo | |
| 2019 | Audi | S5 | Hatchback | 3.0L V6 Turbo | |
| 2020 | Audi | S5 | Hatchback | 3.0L V6 Turbo | |
| 2018 | Audi | S5 | Hatchback | 3.0L V6 Turbo |