Audi A8/S8 Coolant Hose / Line 4H0121081AA
OEM Part #: 4H0-121-081-AA (4H0121081AA)
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 / Water Hose
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The OEM coolant hose, part number 4H0121081AA, serves a critical role in the engine cooling system of various Audi models, specifically designed for the upper section. This connector tube is integral to routing coolant between the reservoir and the engine, ensuring optimal temperature regulation. It is compatible with 2011-2018 Audi A8 Quattro and S8 models featuring the 4.0L V8 and 6.3L W12 engine options. Common failure signs include leaks, cracks, or expansion due to age and heat exposure. Replacing a worn hose helps prevent overheating and coolant loss, preserving engine longevity. This part is also referred to as an overflow hose or reservoir hose, and can interchange with several alternative part numbers.
Specifications
| Fits Vehicle Model | A8, S8 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4H0-121-081-AA (4H0121081AA) |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 24 vehicle configurations across 1 make, 2011-2018.
View all 24 vehicle configurations — 13 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2011 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) CDRA |
| 2011 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) CDRA |
| 2012 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) CDRA |
| 2012 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) CDRA |
| 2012 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2013 | Audi | A8 | Quattro Sedan | 4.0L V8 Turbo | |
| 2013 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2013 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2013 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2014 | Audi | A8 | Quattro Sedan | 4.0L V8 Turbo | |
| 2014 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2014 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2014 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2015 | Audi | A8 | Quattro Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2015 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2015 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2015 | Audi | S8 | Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2016 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2016 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2016 | Audi | S8 | Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2017 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2017 | Audi | S8 | Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2018 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |
| 2018 | Audi | S8 | Sedan | 4.0L V8 Turbo | For Vehicles with Engine Code(s) CTFA, CTGA, CTGF |