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Heating and Cooling› Overflow Tanks and Catch Cans

Genuine

Coolant Expansion Tank

$160.00 $116.99 Save $43.01

SKU: 4E0121403G

In Stock
In Stock
Ships by Jul 29
Free Shipping
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Genuine 4E0121403G is a plastic coolant expansion tank designed for various Audi A8 and S8 models. This component serves as an overflow reservoir for the engine's cooling system. It includes a level sensor for monitoring coolant status.

Fitment

Fitment Guaranteed

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on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandGenuine
Part Number4E0121403G
CategoryHeating and Cooling

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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