Volkswagen Golf 5 Audi A3 8P 2.0 TDI Fuel Injector Injection Nozzle 03G130073G

The Volkswagen Golf 5 Audi A3 8P 2.0 TDI Unit Injector is an original fuel system component for diesel engines, designed for 2.0 TDI units in popular Volkswagen Golf V and Audi A3 8P models. The precise design of the unit injector ensures proper fuel delivery, stable engine operation, and maintenance of factory performance parameters.

Specifications and technical data

• SKU: 03G130073G
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 03G130073G
• Substitutable numbers: 03G130073G, 03G 130 073 G
• Fuel type: Diesel
• Category: Fuel Injectors

Application of the Unit Injector in 2.0 TDI Engines

In a 2.0 TDI engine, the unit injector is responsible for high-pressure diesel fuel dosing directly into the combustion chamber. In vehicles such as the Volkswagen Golf 5 and Audi A3 8P, this component is crucial for:

• maintaining correct power and torque across the entire RPM range,
• stable idle operation and reducing engine vibrations,
• exhaust emission control in accordance with the engine's design specifications,
• optimal fuel consumption during daily use.

By using an original unit injector, compatibility with the factory engine control unit and injection maps is maintained, which facilitates diagnostics and subsequent servicing.

Technical Characteristics and Benefits of Installation

The presented unit injector belongs to the category of injector nozzles and is designed for Diesel fuel. Its construction combines a high-pressure pump and a precise nozzle in a single body, allowing for:

• accurate fuel spray formation in the combustion chamber,
• reduced response time to engine load changes,
• uniform operation of all cylinders, when a correctly matched set of unit injectors is used.

A properly selected component of this type helps to mitigate common symptoms of wear in the injection system, such as difficulty starting a warm engine, power loss, or excessive smoke under load.

Condition, Origin, and Usage Aspects

The offered unit injector is an original Volkswagen component sourced from disassembly. This type of used part offers a sensible compromise between repair cost and maintaining factory quality. In practice, this means:

• preservation of original geometry and operating parameters in line with the vehicle manufacturer's specifications,
• secure mounting fit to the 2.0 TDI engine head in the Golf 5 and Audi A3 8P,
• possibility of using the existing electrical system and factory connectors.

Before installation, the standard workshop procedure is recommended: checking the condition of the seat in the cylinder head, replacing seals, and adapting parameters in the engine control unit if required by the vehicle manufacturer or diagnostic software.

Diagnostics and Preventive Maintenance of the Injection System

In case of problems with the 2.0 TDI engine's operation – such as uneven running, increased fuel consumption, or reduced dynamics – unit injectors are among the first components to be checked. For users who want to better understand the symptoms and consequences of wear in injection components, we recommend the article: Diesel Injector Failures – How to Recognize Them and What Their Neglect Entails. This provides practical knowledge for planning repairs or replacing a unit injector.

Repair Economy and Circular Economy

Choosing a used unit injector from disassembly is not only economical but also reflects a conscious approach to vehicle operation. The reuse of functional components reduces waste and decreases the demand for new parts production. More about the environmental and financial impact of such decisions can be found in the material: Circular Economy in Your Garage – How Choosing Used Parts from Disassembly Truly Supports Environmental Protection and Your Wallet?.

If you are looking for other Volkswagen injector nozzles compatible with various models of this brand, check out the Volkswagen injector nozzles available in our store to select the right part for your car's specific engine version.