OE number 06H 121 601 P is a part number for an auxiliary water pump/coolant pump manufactured by Volkswagen Group (VAG). This part is commonly used in Audi, Volkswagen, and Bentley engines with 2.0T engines and above.

Although the car water pump has a simple structure, it is the power source for the engine cooling system and is crucial to the engine’s health. Understanding its function, working principle, and common faults helps car owners to identify potential problems in a timely manner and perform proper maintenance, thus avoiding major issues and protecting the expensive engine.