URO 8E0121403A Engine Coolant Reservoir

Engine Coolant Reservoir for Audi A4

This URO engine coolant reservoir is a direct-fit replacement for select Audi A4 and Audi A4 Quattro models. Built to OE dimensions and factory pressure-tested, it is made to match original sensor and hose connections for a straightforward cooling system repair.

Key Features

• Guaranteed fitment for listed Audi applications
• Precision-molded to OE dimensions for sensor and connection compatibility
• Heat-resistant materials for engine bay cooling system conditions
• Factory pressure-tested for leak resistance
• Includes level sensor
• 24 Month Unlimited Mileage Warranty

Product Details

URO part number 8E0121403A is an engine coolant reservoir for 2002-2006 Audi A4 Quattro and 2002-2005 Audi A4 models. It is engineered to follow original equipment dimensions so the reservoir aligns with the factory cooling system layout, including the level sensor connection. This part number 8E0121403A is a practical choice when replacing a cracked, leaking, or heat-aged expansion tank on an Audi A4 or Audi A4 Quattro.

This part cross-references VAICO V10-8284 for the same application.

Common Reasons for Replacement

• Coolant leaks from a cracked reservoir
• Low coolant warnings caused by a faulty level sensor area
• Visible discoloration, warping, or heat damage
• Pressure loss in the cooling system
• Overflow or seepage around reservoir seams

Installation Notes

Verify the reservoir matches the original sensor and hose layout before installation. Inspect the cap, hoses, and surrounding cooling system components for wear, contamination, or damage while the reservoir is removed. After installation, refill and bleed the cooling system according to factory service procedures to help prevent trapped air.

Quality Assurance

URO manufactures this coolant reservoir with heat-resistant materials and factory pressure testing to support reliable cooling system service. It is backed by a 24 Month Unlimited Mileage Warranty.