United States
Product overview
Genuine OEM Audi Coolant Expansion Tank Vent Line, part number 4G0121081CQ. This line is crucial for allowing air to escape from the coolant expansion tank, maintaining optimal pressure and preventing air pockets in the cooling system. It connects to the expansion tank. Made from durable, heat-resistant rubber or plastic, it measures approximately 0.21 meters in length. Using a genuine OEM vent line ensures precise fitment and material integrity, critical for the long-term reliability of the engine cooling system.
Catalogue entry: PIPE left front.
Technical details
- Category
- Engine Cooling
- Country of origin
- Germany
- Customs (HS) code
- 40093100
- Manufacturer
- Audi
- Product Type
- Genuine new auto parts
- Shipping size (L × W × H)
- 21 × 4 × 2.5 cm
- Shipping weight
- 0.01 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
4 vehiclesBreather Line — locate 4G0121081CQ Audi Coolant Expansion Tank Vent Line | OEM in the official exploded view and explore the surrounding assembly.
Parts in this assembly30
- 1Hose 4G0122101P
- 2Seal Ring 4E0121666
- 3Spring 4E0121142
- 4Connection 079121137M
- 5Seal 079121043A
- 6Bolt N10124306
- 7Pipe 4G0121081CR
- 7Pipe 4G0121081BF
- 8Bracket 3D0971741
- 9Pipe 4G0121081CP
- 9Pipe 4G0121081CH
- 10Pipe 4G0121081BH
- 11Pipe 4G0121081CS
- 11Pipe 4G0121081BT
- 12Water Pipe 079121085N
- 13Seal Ring WHT001011
- 14Bolt N10405604
- 15Clamp N10466904
- 16Collar Nut N01508210
- 17Water Pipe 079121083H
- 18Water Pipe 079121075E
- 19Seal Ring WHT005652
- 20Water Pipe 079121071CM
- 20Water Pipe 079121071CK
- 21Seal Ring N90912501
- 22Bolt N91148001
- 23Clamp N90928502
- 60Clamp N90686701
- 61Clamp N90686902
- 62Clamp N90926501
Compatible / alternative parts(2)
Vehicle fitment table4
Europe (4)
| Vehicle | Years | Pos. | Qty |
|---|---|---|---|
| Audi A7 Sportback | 2014-2018 | 10 | 1 |
| audi a6 qu. 3.0 tdi | 2014-2018 | 10 | 1 |
| Audi A7 Sportback | 2010-2015 | 10 | 1 |
| audi a6 2.0 tdi | 2010-2015 | 10 | 1 |
Diagrams & fitment data powered by oemdiagrams.com
4G0121081CQ Audi Coolant Expansion Tank Vent Line | OEM is fitted on: Audi A7 Sportback 2014-2018; audi a6 qu. 3.0 tdi 2014-2018; Audi A7 Sportback 2010-2015; audi a6 2.0 tdi 2010-2015.