2004-2007 Audi A8 Coolant / Water Tube / Pipe 4E0121400B
OEM Part #: 4E0-121-400-B (4E0121400B)
Actual photo
The exact part you’ll receive — not a stock photo.
$22.99
Used
DonorNone Audi Multi Qty
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Genuine OEM Used
SKU: 153304
Donor Vehicle: None Audi Multi Qty
2 photos
$22.99
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Genuine OEM Used
SKU: 194075
Donor Vehicle: 2005 Audi A8 · 4.2L
2 photos
$22.99
30-Day Returns
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The Audi A8 Quattro coolant/water tube (OEM 4E0121400B) is a genuine used pipe that also replaces 4E9121400. This part routes coolant through the 4.2L V8 engine family—both the 4163CC and 4172CC naturally aspirated versions. When this tube develops a leak, it can cause low coolant, overheating, or visible drips under the hood. Inspect the plastic or metal junctions for cracks, especially on higher-mileage vehicles.
Specifications
| Fits Vehicle Model | A8 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4E0-121-400-B (4E0121400B) |
| Compatible OEM Part No | 4E9-121-400 |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 7 vehicle configurations across 1 make, 2004-2007.
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 7 vehicle configurations — 7 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2005 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |
| 2007 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |
| 2006 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |
| 2006 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |
| 2007 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |
| 2004 | Audi | A8 | Quattro L Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |
| 2005 | Audi | A8 | Quattro Sedan | 4.2L V8 | For Vehicles with Engine Code(s) BFM |