Audi RS7/S6/S7 Coolant Reservoir Breather Hose / Line Left, Rear 4G0121081CS
OEM Part #: 4G0-121-081-CS (4G0121081CS)
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 Hose / Pipe / Line that may fit your vehicle
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Coolant Hose / Hose
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The OEM Coolant Reservoir Breather Hose (Part Number: 4G0121081CS) is a direct replacement component designed for Audi vehicles, specifically the RS7, S6, and S7 models from 2014 to 2018. This essential vent tube is located at the rear left of the engine compartment, playing a crucial role in maintaining optimal coolant pressure and preventing vapor lock. Over time, this hose may become worn or damaged, leading to coolant leaks or inefficient cooling system performance. Common alternative terms for this part include reservoir hose and vent pipe. Ensure your Audi remains in peak operating condition by replacing worn breather hoses with this genuine OEM part to guarantee perfect fit and function.
Specifications
| Fits Vehicle Model | RS7, S6, S7 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4G0-121-081-CS (4G0121081CS) |
| Side | Left, Rear |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 16 vehicle configurations across 1 make, 2013-2018.
View all 16 vehicle configurations — 5 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2013 | Audi | S6 | Sedan | 4.0L V8 Turbo | For Vehicles with Production Date After 04/15/13 |
| 2013 | Audi | S7 | Hatchback | 4.0L V8 Turbo | For Vehicles with Production Date After 04/15/13 |
| 2014 | Audi | RS7 | Hatchback | 4.0L V8 Turbo | |
| 2014 | Audi | S6 | Sedan | 4.0L V8 Turbo | For Vehicles with Production Date After 04/15/13 |
| 2014 | Audi | S7 | Hatchback | 4.0L V8 Turbo | For Vehicles with Production Date After 04/15/13 |
| 2015 | Audi | RS7 | Hatchback | 4.0L V8 Turbo | |
| 2015 | Audi | S6 | Sedan | 4.0L V8 Turbo | For Vehicles with Production Date After 04/15/13 |
| 2016 | Audi | RS7 | Hatchback | 4.0L V8 Turbo | |
| 2016 | Audi | S6 | Sedan | 4.0L V8 Turbo | |
| 2016 | Audi | S7 | Hatchback | 4.0L V8 Turbo | |
| 2017 | Audi | RS7 | Hatchback | 4.0L V8 Turbo | |
| 2017 | Audi | S6 | Sedan | 4.0L V8 Turbo | |
| 2017 | Audi | S7 | Hatchback | 4.0L V8 Turbo | |
| 2018 | Audi | RS7 | Hatchback | 4.0L V8 Turbo | |
| 2018 | Audi | S6 | Sedan | 4.0L V8 Turbo | |
| 2018 | Audi | S7 | Hatchback | 4.0L V8 Turbo |