Buy 2009 Audi S6 Engine Coolant Reservoir. 5.2 LITER, MAIN. S6. Engine Coolant Expansion Tank - - OEM Audi Part # 4F0121403AA (4F0-121-403-AA, 4F0121403E, 4F0121403P)

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

Engine Coolant Reservoir

Fits S6

5.2 LITER, MAIN. S6.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2009 Audi S6 to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.