United States
Product overview
Genuine OEM Audi Expansion Tank Breather Line, part number 4H0121081AH. This hose is designed to allow air to escape from the cooling system's expansion tank, ensuring proper pressure regulation and preventing air pockets that can hinder cooling efficiency. It is located at the left rear of the engine bay, connected to the expansion tank. Weighing approximately 0.019 kg, this line is made from durable, heat-resistant material. Choosing genuine OEM ensures the correct routing, flexibility, and resistance to coolant for reliable cooling system operation.
Catalogue entry: PIPE left rear.
Technical details
- Category
- Engine Cooling
- Country of origin
- Germany
- Customs (HS) code
- 87089997
- Manufacturer
- Audi
- Product Type
- Genuine new auto parts
- Shipping size (L × W × H)
- 24 × 6.5 × 2.5 cm
- Shipping weight
- 0.02 kg
Why buy from WW Spares?
- ✓ Genuine OEM inventory sourced directly from factory networks
- ✓ Fitment support from workshop-seasoned parts specialists
- ✓ Global logistics with customs-ready documentation
Need help confirming compatibility? Talk to a specialist
Parts diagram & fitment
2 vehiclesBreather Line — locate 4H0121081AH Audi Expansion Tank Breather Line | Left Rear in the official exploded view and explore the surrounding assembly.
Parts in this assembly48
- 1Hose 4H0121101AC
- 2Seal Ring 4E0121666
- 3Spring 4E0121142
- 4Water Pipe 059121071CM
- 5Seal Ring N90275302
- 6Bolt N10451408
- 7Bolt N10517304
- 8Cover 059121155T
- 9Seal Ring N90783401
- 10Screw N10170303
- 11Cover 059121155R
- 14Water Pipe 059121512H
- 16Hose 4H0121447AC
- 17Valve 4H0121671G
- 18Screw N91032702
- 19Bracket 4H0121305F
- 20Screw N10619001
- 21Hose 4H0121448N
- 24Hose 4H0121449Q
- 26Water Pipe 4H0121485AA
- 27Collar Nut N01508210
- 28Hose 4H0819373G
- 29Water Pipe 059121075DK
- 30Seal Ring 059121437
- 32Bracket 059121093E
- 33Screw N10644901
- 34Cover 059121155AM
- 34Cover 059121155S
- 35Hose 4H0121055AB
- 36Sender 06A919501A
- 37Seal Ring N90316801
- 38Spring 032121142
- 39Hose 4H0121088AD
- 41Part 4D0133335
- 43Pipe 4H0121081AB
- 45Hose 059121054C
- 46Connection 059121131Q
- 46Connection 059121131G
- 47Bolt N10156206
- 48Connection 059121131H
- 48Connection 059121131J
- 48Connection 059121131F
- 49Hose 059121053J
- 50Seal Ring WHT001011A
- 50Seal Ring WHT001225
- 51Bracket N10620201
- 60Clamp N90686902
- 61Clamp N90687001
Compatible / alternative parts(12)
Vehicle fitment table2
Europe (2)
| Vehicle | Years | Pos. | Qty |
|---|---|---|---|
| Audi A8L qu. 3.0 TDI | 2013-2018 | 42 | 1 |
| Audi A8L qu. 3.0 TDI | 2009-2014 | 42 | 1 |
Diagrams & fitment data powered by oemdiagrams.com
4H0121081AH Audi Expansion Tank Breather Line | Left Rear is fitted on: Audi A8L qu. 3.0 TDI 2013-2018; Audi A8L qu. 3.0 TDI 2009-2014.