Details

• Brand:

  

• SKU:

  1K0-121-407-F

• Other Names:

  Expansion Tank, Reservoir, Tank

• Description:

  Genuine Audi Reservoir Tank is the factory-correct cooling system expansion tank engineered for the Audi A3, Q3, TT, and TTS. This OEM replacement serves as the pressurized holding vessel for coolant in your engine's thermal management system, accommodating fluid expansion as temperatures rise and contracting it back into circulation as the engine cools — a continuous cycle that keeps operating temperatures stable and prevents overheating damage. Unlike aftermarket alternatives, the genuine Audi reservoir tank is manufactured to precise factory tolerances with OEM-grade materials that resist cracking under prolonged heat cycling, ensuring the pressure cap seat and sensor ports maintain a reliable seal throughout the part's service life. Aftermarket tanks frequently use substandard plastics that become brittle prematurely, leading to coolant leaks, low fluid warnings, and potential engine damage — risks that simply aren't acceptable when OEM pricing is this competitive. Whether you're searching for an Audi Q3 TT TTS A3 OEM reservoir tank, an expansion tank, or referencing the part as 1K0121407F, this is the exact component Audi engineers specified for your vehicle. Audi Henderson is an authorized Audi dealership offering this part backed by a one-year manufacturer warranty, giving you complete confidence in every purchase.

• Applications: 2.0L, 3.2L.
• Replaces:

  1k0121407a

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