Genuine Audi Expansion Tank Reservoir 4H0121403M OEM A8 - Audi (4H0-121-403-M)
2011-2018 Audi A8 Quattro - 4h0121403m
Genuine Audi Expansion Tank Reservoir 4H0121403M OEM A8 - Audi (4H0-121-403-M)
2011-2018 Audi A8 Quattro - 4h0121403m
- Audi
- 4H0-121-403-M
- 4h0121403g
Details
- Brand:
- SKU:
4H0-121-403-M
- Other Names:
Expansion Tank, Reservoir, Tank
- Description:
Genuine Audi Expansion Tank is a genuine OEM cooling system component designed specifically for the Audi A8, covering model years 2013 through 2018 across multiple engine configurations including 4.2L gas, 6.3L gas, and diesel applications. This pressurized reservoir serves as the central hub of your A8's cooling system, storing and releasing coolant as the engine heats and cools, while allowing air bubbles to escape and maintaining consistent system pressure. Choosing a genuine Audi A8 OEM Expansion Tank over an aftermarket alternative matters significantly here because this tank must maintain precise pressure tolerances calibrated to Audi's exact cooling specifications — an imprecise fit or substandard plastic compound can lead to cracking, pressure loss, and ultimately catastrophic engine overheating. Aftermarket versions frequently use lower-grade polymers that degrade faster under the extreme thermal cycling these engines produce, making an already expensive repair far worse down the road. Sourced directly from Audi, part number 4H0121403M guarantees the exact wall thickness, nipple placement, and pressure rating your vehicle requires for long-term reliability. Whether you're searching for an Audi A8 OEM Expansion Tank or the reservoir simply listed as 4H0-121-403-M, Audi Henderson is an authorized Audi dealer offering this genuine part backed by the manufacturer's warranty.
- Applications: 3.0L GAS.
- Replaces:
4h0121403g
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov - MSRP: $140.01
- Discount: $44.25 (31.6% off)
- Sale Price: $95.76
- Audi
- 4H0-121-403-M
- 4h0121403g
Details
- Brand:
- SKU:
4H0-121-403-M
- Other Names:
Expansion Tank, Reservoir, Tank
- Description:
Genuine Audi Expansion Tank is a genuine OEM cooling system component designed specifically for the Audi A8, covering model years 2013 through 2018 across multiple engine configurations including 4.2L gas, 6.3L gas, and diesel applications. This pressurized reservoir serves as the central hub of your A8's cooling system, storing and releasing coolant as the engine heats and cools, while allowing air bubbles to escape and maintaining consistent system pressure. Choosing a genuine Audi A8 OEM Expansion Tank over an aftermarket alternative matters significantly here because this tank must maintain precise pressure tolerances calibrated to Audi's exact cooling specifications — an imprecise fit or substandard plastic compound can lead to cracking, pressure loss, and ultimately catastrophic engine overheating. Aftermarket versions frequently use lower-grade polymers that degrade faster under the extreme thermal cycling these engines produce, making an already expensive repair far worse down the road. Sourced directly from Audi, part number 4H0121403M guarantees the exact wall thickness, nipple placement, and pressure rating your vehicle requires for long-term reliability. Whether you're searching for an Audi A8 OEM Expansion Tank or the reservoir simply listed as 4H0-121-403-M, Audi Henderson is an authorized Audi dealer offering this genuine part backed by the manufacturer's warranty.
- Applications: 3.0L GAS.
- Replaces:
4h0121403g
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov Also Purchased
Vehicle Fitment
| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|
AUDI HENDERSON
Welcome to Audi OEM Parts, your number one source for all things Audi. We're dedicated to providing you the very best parts and accessories, with an emphasis on OEM fitment.
You can order your Genuine Audi Expansion Tank Reservoir 4H0121403M OEM A8 (4h0121403m) right now and have it delivered to your home or work in just a matter of days. Guaranteed to fit your 2011-2018 Audi A8 Quattro vehicle and we also offer a VIN verification system at checkout.
If you would like to browse your vehicle's specific OEM parts catalog, you can do so by first selecting what model you drive.
| Audi Models |
Audi
AudiOEMParts.com is operated by Audi Henderson, an authorized Audi dealership and part of the Findlay Automotive Group in Henderson, NV. We stock genuine Audi OEM parts and accessories for every model — A3, A4, A5, A6, A7, A8, Q3, Q5, Q7, Q8, TT, R8, e-tron, and beyond.
Every part ships directly from factory inventory with full Audi manufacturer warranty. No aftermarket substitutes. No compatibility guessing. Exact fit, every time.
Order online and ship nationwide. Same parts Audi technicians use, at authorized dealer pricing, with the speed of online ordering. Questions? Call 888-448-6114 or email [email protected].