Coolant expansion tank - 4N0121405

Original coolant expansion tank designed for Audi cars, specifically for the A8 4N model with 3.0 TDI engines.

This is a factory OEM component responsible for maintaining the proper level and pressure of the coolant in the engine cooling system.

Technical specifications

• OE part number: 4N0121405 (alternative notation: 4N0 121 405)
• Function: Storing excess coolant and stabilizing pressure in the system
• Condition: Original used part - 100% functional, tested, without damage
• Manufacturer: VAG OEM

Main application

• Audi: A8 4N 3.0 TDI

Fitment guarantee

Every part undergoes quality and functionality testing before shipping.

Tip: Before purchasing, we recommend carefully comparing the OE part number and verifying it using the chassis number (VIN).