Genuine 8W0 121 081 DA Coolant Breather Line Overflow Tube

The Genuine Audi 8W0 121 081 DA is an OEM coolant breather line (also known as a coolant overflow hose or breather tube) that serves as a critical component in Audi's closed-loop engine cooling system. This pipe channels coolant back to the overflow or recovery bottle, maintaining proper fluid circulation and helping prevent dangerous engine overheating.

This is a direct factory replacement for the original equipment part, sourced from the Volkswagen Group and backed by a 24-month factory warranty. It supersedes earlier part number 8W0-121-081-BN.

Key Features:

• Genuine OEM Audi / Volkswagen Group part — guaranteed factory fit and finish
• Functions as the coolant overflow breather tube in a closed-loop cooling circuit
• Replaces part number 8W0-121-081-BN (supersession)
• Also referenced as: Overflow Hose, Breather Tube, Coolant Pipe, Engine Coolant Overflow Hose
• Covered by 24-month factory warranty
• Applicable to 2.9L and 3.0L engine applications, center/coupe position

Over time, heat cycling causes factory plastic coolant lines to become brittle and crack at connection points, leading to coolant leaks and low coolant warnings. Replacing a failing breather line with this genuine OEM component restores cooling system integrity and protects the engine from thermal damage. OEM cross-references: 8W0121081BN, 8W0121081DA.