Audi A4 B8 Skoda Octavia Mk3 2.0 TDI Fuel Rail Injection Rail Line 03L130089Q

Audi A4 B8 Q5 8R 2.0 TDI Diesel Fuel Rail Injection Rail Line is a fuel system component designed for diesel engines, which stabilizes fuel pressure and ensures precise fuel delivery to the injectors. Thanks to a design compliant with the Audi OEM standard, the rail works seamlessly with factory electronics and engine accessories, supporting smooth engine operation and the correct fuel dosage across the entire load range.

Specifications and technical data

• SKU: 03L130089Q-1
• Mark: Skoda
• Condition: Used
• OEM Part Number: 03L130089Q
• Substitutable numbers: 03L130089Q, 03L 130 089 Q, 057130764AB, 057 130 764 AB
• Fuel type: Diesel
• Part type: Fuel Injector
• Category: Fuel Injectors

Purpose and role in the diesel fuel system

The fuel rail in a 2.0 TDI engine acts as a common fuel manifold to which the injectors are connected. It is responsible for:

• maintaining stable fuel pressure throughout the common rail system,
• even fuel supply to all cylinders,
• cooperation with sensors and the engine control unit (ECU) regarding fuel dosing,
• limiting pressure fluctuations during sudden load changes.

For diesel units, the fuel type: Diesel is crucial for proper operating characteristics – a correctly selected fuel rail helps maintain engine refinement, dynamics, and emission control.

Compatibility with Audi models

The presented fuel rail is designed for fuel systems in Audi A4 B8 generation and Audi Q5 8R models with a 2.0 TDI engine. Using a component from the Injector nozzles group that complies with factory standards allows for maintaining the consistency of the entire fuel system – from the high-pressure pump, through the rail, to the injectors.

Such compatibility is particularly important when diagnosing and repairing issues with starting, power loss, or rough engine operation, where the fuel rail is one of the key elements to verify.

Component condition and installation aspects

The product is offered as a used part, which allows for cost-effective repair of the fuel system while maintaining the manufacturer's original specifications. In practice, this means the ability to restore the proper operation of the common rail system without the need to invest in a new OEM component.

The fuel rail is designed for installation in place of the factory element, maintaining original mounting points and fuel connections. During replacement, it is recommended to:

• thoroughly clean the sockets and fuel lines,
• check for leaks after installation,
• verify pressure parameters using computer diagnostics.

Benefits of using an original Audi fuel rail

Using a fuel rail compliant with the factory Audi standard supports:

• stable diesel engine operation across the full RPM range,
• proper cooperation with injectors and the engine control unit,
• maintaining combustion and emission parameters at the levels intended by the manufacturer,
• reducing the risk of secondary faults resulting from improper fuel pressure.

For users who want to consciously take care of their fuel system, this is a solution that is technically consistent with the rest of the engine equipment, which facilitates diagnostics and service in the future.

Fault diagnostics and technical knowledge

Problems with the fuel rail or the injectors working with it can manifest as, among others, hard starting, jerking, power loss, or smoke. To better understand typical symptoms and verification methods, it is worth consulting specialist materials. An extensive discussion of the topic can be found in the article Diesel injector faults – how to recognize them and the risks of neglecting them, which describes the symptoms, consequences, and basics of diagnosing injection systems in diesel engines.

Related Audi injection system components

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as injectors, high-pressure lines, or control valves, check the available parts in the Audi injector nozzles category.