OE number 16100-49877 is an original equipment manufacturer (OEM) part number for Toyota and Lexus engines, specifically for the water pump assembly.

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.