Buy Audi S4 Engine Coolant Reservoir. 2.9 LITER, MAIN. 3.0 LITER. 3.0 LITER, MAIN. CONVERTIBLE, 3.0 - OEM Audi Part # 8W1121405N (8W1-121-405-N, 8W1121405K)

Engine Coolant Reservoir. Expansion tank.
A container that holds Engine Coolant.

Engine Coolant Reservoir

Fits S4 (2018 - 2024)

2.9 LITER, MAIN. 3.0 LITER. 3.0 LITER, MAIN. CONVERTIBLE, 3.0 LITER, MAIN. Coupe, 3.0 LITER, MAIN. MAIN. RS5. S4. S5.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your Audi S4 to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.