Audi A3 8V A4 B8 Electric Water Pump Unit 2.0 TDI Diesel Engine 04L121011E

The Audi A3 8V A4 B8 2.0 TDI Diesel Electric Water Pump is an original part from the Water Pumps group, designed for 2.0 TDI diesel engines. This used OEM part ensures a factory fit for the cooling system, facilitating installation and minimizing operational issues.

Specifications and technical data

• SKU: 04L121011E-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L121011E
• Substitutable numbers: 04L121011E, 04L 121 011 E
• Fuel type: Diesel
• Part type: Engine Water Pump
• Category: Water Pumps

Purpose and Role in the Cooling System

The electric water pump in 2.0 TDI units is responsible for forcing the circulation of coolant, stabilizing the operating temperature of the diesel engine. A properly functioning component of this type:

• ensures efficient heat dissipation from the engine block and cylinder head,
• reduces the risk of overheating during city and highway driving,
• supports the smooth operation of the powertrain across the full range of loads.

Thanks to its design tailored for Audi A3 8V and A4 B8 models with the 2.0 TDI engine, the pump works with the factory control system and cooling system without requiring any installation modifications.

Benefits of Using an Original Audi Pump

Choosing an original electric water pump for your Audi offers a number of practical advantages:

• Factory Compatibility – maintains conformity with the vehicle's cooling system and electronics.
• Stable operating parameters – predictable performance under typical driving conditions for a diesel engine.
• Reduced risk of leaks and air-trapping issues after installation.

This solution is particularly beneficial for servicing 2.0 TDI units, where precise temperature control is crucial for the durability of the components and driving comfort.

Characteristics of a Used Component

The electric water pump presented is a used part, sourced from disassembly. This type of component is a sensible choice for budget-conscious repairs or phased cooling system overhauls, where maintaining original specifications at a lower purchase cost is a priority.

A used Audi water pump allows for:

• preservation of the original geometry of connections and mounting points,
• easy installation in place of the factory component,
• reduction of vehicle downtime in the workshop.

Selection by Part Numbers and Fuel Type

This model is designed for Diesel fuel type engines, which is crucial when selecting parts for the Audi A3 8V and A4 B8. Verifying compatibility by part numbers and manufacturer markings helps avoid installation problems and ensures proper cooperation with the engine control system.

If you have any doubts during selection, it is advisable to compare the markings with your existing pump or seek assistance from a specialist to match the correct variant for your specific 2.0 TDI engine configuration.

Technical Support and Educational Materials

To better understand the relationship between the cooling system and diesel engine power supply, knowledge about the operation of the entire fuel system and its components can be helpful. A detailed discussion on diagnostics, selection by OEM numbers, and operating principles can be found in the article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair, which helps to approach engine servicing comprehensively.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other parts from the same group, such as additional pumps, coolant circulation components, or related cooling system parts, check the available parts in the Audi Water Pumps category.