Audi A4 B8 Q5 8R 2.0 TDI Diesel Fuel Rail Injection Rail Line 03L130089Q

The Audi A4 B8 Q5 8R 2.0 TDI Diesel Fuel Rail is an original component of the high-pressure diesel fuel system, designed for 2.0 TDI diesel engines in Audi A4 B8 and Audi Q5 8R models. It ensures stable fuel distribution to the injectors, which translates to smooth engine operation and correct combustion characteristics.

Specifications and technical data

• SKU: 03L130089Q
• Mark: Audi
• Condition: Used
• OEM Part Number: 03L130089Q
• Substitutable numbers: 03L130089Q, 03L 130 089 Q, 057130764AB, 057 130 764 AB
• Fuel type: Diesel
• Category: Fuel Injectors

Purpose and Role in the Injection System

The fuel rail for Audi 2.0 TDI operates within a common rail system, responsible for buffering fuel under high pressure and its even distribution to individual injectors. A correctly selected fuel rail helps maintain:

• stable fuel pressure across the entire engine load range,
• precise dosing by the injectors,
• consistent performance characteristics of the 2.0 TDI unit under driving conditions.

This component is crucial for the proper functioning of the injection system, influencing engine smoothness, exhaust emissions, and fuel consumption.

Compatibility and Technical Specifications

The presented fuel rail belongs to the category of Injector Nozzles, but in practice, it serves as the central fuel distributor for the entire injection set. It is designed for use with compression-ignition engines, therefore intended for systems where the fuel type is Diesel.

Thanks to the use of an original Audi solution, the following are ensured:

• geometric compatibility with the engine head and ancillary components of the 2.0 TDI engine,
• correct positioning of the ports relative to the injectors and high-pressure lines,
• appropriate flow characteristics for Audi A4 B8 and Q5 8R diesel engines.

Characteristics of a Used Component

The fuel rail comes from a secondary market source, allowing for an economical repair of the fuel system while maintaining the original Audi design. A used component of this type is often chosen in situations where:

• a quick replacement of a damaged fuel rail is necessary without interfering with other system components,
• it is important to maintain the factory specification of the injection system,
• a budget-friendly solution is sought while utilizing OEM parts.

Prior to installation, a standard check of system tightness and fuel pressure parameters in conjunction with the injectors is recommended.

Application in Diesel System Diagnostics and Repairs

In case of problems with the 2.0 TDI engine's operation – such as rough idling, power loss, or starting difficulties – the fuel rail is one of the components considered during diagnostics. Replacing the fuel rail may be justified, for example, in cases of detected leaks or mechanical damage to the body.

To better understand the relationship between the fuel rail, injector operation, and fault symptoms, it is advisable to consult the guide: diesel injector faults – symptoms, consequences, and diagnostics. This will help to more accurately assess whether the source of the problem is the fuel rail itself or other components of the injection system.

Related Products and Vehicle Preparation for Operation

For comprehensive fuel system servicing, it is also advisable to periodically check other components related to the diesel engine's operation, especially before the winter season. The guide: winter essentials: used car parts to check before the frost may be helpful, facilitating the planning of preventive maintenance actions.

If you are looking for other Audi injector nozzles compatible with various models of this brand, check out our dedicated category: Audi injector nozzles. This will allow you to easily select injection system components that match your specific engine and vehicle generation.