Genuine Audi Expansion Tank 420121403 OEM Authorized Dealer Factory Original - Audi (420-121-403)
2008-2015 Audi - 420121403
Genuine Audi Expansion Tank 420121403 OEM Authorized Dealer Factory Original - Audi (420-121-403)
2008-2015 Audi - 420121403
- Audi
- 420-121-403
Details
- Brand:
- SKU:
420-121-403
- Other Names:
Reservoir, Expansion Tank, Tank
- Description:
Genuine Audi Expansion Tank is a genuine Audi OEM cooling system component designed to maintain proper coolant levels and pressure in compatible Audi Q7 and R8 gas models. This pressurized reservoir manages coolant expansion and contraction as your engine cycles through operating temperatures, preventing air pockets and pressure imbalances that can lead to overheating or coolant loss over time. Choosing a genuine OEM expansion tank over an aftermarket alternative matters more than many drivers realize. Cooling system reservoirs must withstand continuous exposure to heat, pressure fluctuations, and chemical degradation from coolant additives. Aftermarket versions frequently use lower-grade plastics that become brittle, develop micro-cracks, or fail to seal properly at the cap interface — compromising the entire cooling system. The Audi OEM unit 420121403 is engineered to exact factory tolerances, ensuring correct pressure ratings, proper fitment, and long-term durability that protects your engine investment. Whether you're searching for an Audi Q7 R8 OEM Expansion Tank, a coolant reservoir replacement, or simply need part 420-121-403, this is the same component installed at the factory — no guesswork, no fitment concerns. Audi Henderson is an authorized Audi dealer offering this part backed by the manufacturer's warranty for complete peace of mind.
- Applications: 4.2L. 5.2L. 3.0L GAS.
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov - MSRP: $511.67
- Discount: $164.76 (32.2% off)
- Sale Price: $346.91
- Audi
- 420-121-403
Details
- Brand:
- SKU:
420-121-403
- Other Names:
Reservoir, Expansion Tank, Tank
- Description:
Genuine Audi Expansion Tank is a genuine Audi OEM cooling system component designed to maintain proper coolant levels and pressure in compatible Audi Q7 and R8 gas models. This pressurized reservoir manages coolant expansion and contraction as your engine cycles through operating temperatures, preventing air pockets and pressure imbalances that can lead to overheating or coolant loss over time. Choosing a genuine OEM expansion tank over an aftermarket alternative matters more than many drivers realize. Cooling system reservoirs must withstand continuous exposure to heat, pressure fluctuations, and chemical degradation from coolant additives. Aftermarket versions frequently use lower-grade plastics that become brittle, develop micro-cracks, or fail to seal properly at the cap interface — compromising the entire cooling system. The Audi OEM unit 420121403 is engineered to exact factory tolerances, ensuring correct pressure ratings, proper fitment, and long-term durability that protects your engine investment. Whether you're searching for an Audi Q7 R8 OEM Expansion Tank, a coolant reservoir replacement, or simply need part 420-121-403, this is the same component installed at the factory — no guesswork, no fitment concerns. Audi Henderson is an authorized Audi dealer offering this part backed by the manufacturer's warranty for complete peace of mind.
- Applications: 4.2L. 5.2L. 3.0L GAS.
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov Also Purchased
Vehicle Fitment
| Year | Make | Model | Body & Trim | Engine & Transmission |
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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 420121403 OEM Authorized Dealer Factory Original (420121403) right now and have it delivered to your home or work in just a matter of days. Guaranteed to fit your 2008-2015 Audi vehicle and we also offer a VIN verification system at checkout.
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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].