17117639021 Engine Coolant Expansion Tank Cap For BMW

Part number 17117639021 is a BMW OEM Engine Coolant Expansion Tank Cap. It is a critical safety component designed to seal the primary plastic expansion reservoir and maintain a precise pressurized environment for the engine's cooling system.

Vehicle Compatibility:

• BMW 3 Series & 4 Series: E90, E92, E93, F30, F32, F33, F80 (M3), F82 (M4).
• BMW 5 Series & 6 Series: E60, E61, F10, F11, F07 (GT), E63, E64, F12, F13.
• BMW 7 Series: F01, F02, F04, G11, G12.
• BMW X Series SUVs: X5 (E70, F15, G05), X6 (E71, F16, G06), and X7