2004-2010 Audi A8 Coolant Reservoir Tank Hose / Line 4E0121109N
OEM Part #: 4E0-121-109-N (4E0121109N)
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 Expansion Tank Hose / Line
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This OEM coolant reservoir tank hose, part number 4E0121109N, is a crucial component for the Audi A8 Quattro models with the 4.2L V8 engine, spanning years 2007 to 2010. Positioned between the coolant reservoir and various cooling system components, this hose ensures optimal coolant circulation, essential for maintaining engine temperature and performance. Common issues demanding hose replacement include leaks, cracks, or wear that can lead to coolant loss, potentially causing engine overheating or damage. This part is interchangeably referred to as a coolant return hose. Compatible Audi models include A8 Quattro from 2007 to 2010, ensuring you receive a genuine part from salvage vehicles for a reliable replacement. Alternative part numbers include 4E0121101BS and N90986501, emphasizing its authenticity and factory-original status.
Specifications
| Fits Vehicle Model | A8 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4E0-121-109-N (4E0121109N) |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 13 vehicle configurations across 1 make, 2004-2010.
View all 13 vehicle configurations — 7 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2004 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2005 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2005 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2006 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2006 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2007 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2007 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BVJ |
| 2008 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2008 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2009 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2009 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2010 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2010 | Audi | A8 | Quattro L Sedan | 4.2L V8 |