Audi RS4 B7 R8 42 Fuel Injection Injector Nozzle 4.2 FSI BNS 079906036D

Audi RS4 B7 R8 42 Fuel Injection Injector Nozzle 4.2 FSI BNS is an original component from the Fuel Injector Nozzles group, designed for precise fuel delivery in FSI gasoline engines. Engineered by the vehicle manufacturer, it ensures stable engine operation, correct fuel dosage, and predictable engine performance across the full load range.

Specifications and technical data

• SKU: 079906036D
• Mark: Audi
• Condition: Used
• OEM Part Number: 079906036D
• Substitutable numbers: 079906036D, 079 906 036 D, 079 906 036 AB, 079906036AB
• Part type: Fuel Injector
• Category: Fuel Injectors

Application and function of the FSI injector

This fuel injector operates within the FSI direct injection system, where fuel spray stability and dosage repeatability at high operating pressure are critical. It is responsible for forming the mixture in the combustion chamber, which directly impacts engine refinement, throttle response, and fuel consumption. In 4.2 FSI engines, used in models such as the RS4 B7 and R8, properly functioning injectors are particularly important due to high RPMs and thermal loads. A functional component from this group helps reduce the risk of rough idling, power loss, or excessive smoke during dynamic acceleration.

Benefits of using an original injector nozzle

Choosing an original FSI fuel injector for the 4.2 BNS unit ensures:

• Proper spray characteristics matched to the combustion chamber of the specific engine.
• Correct compatibility with the factory engine control unit and injection maps.
• Reduced risk of starting issues on both warm and cold engines.
• Better fuel dosage repeatability compared to aftermarket replacements of uncertain origin. This allows for maintaining engine performance parameters close to factory specifications, which is particularly important in powerful, high-revving gasoline engines.

Component condition and installation aspects

The offered injector belongs to the Fuel Injector Nozzles category and is a used component, allowing for cost-effective repairs without compromising the manufacturer's original design. Before installation, standard workshop procedures are recommended: leak testing, verification on a test bench, and replacing seals according to the model's service recommendations. Professional installation of an injector in an FSI engine requires maintaining clean seats, correct tightening torque for mounts, and parameter adaptation in the ECU if required by the service procedure. This approach minimizes the risk of leaks, overheating of the injector tip, and subsequent issues with engine operation.

Diagnostics and maintenance of the injection system

Symptoms of wear or improper injector operation may include rough engine running, power loss, increased fuel consumption, or error codes stored in the ECU. In case of doubt, it is worth consulting educational material regarding injection system diagnostics – the article on injector faults, their symptoms, and the consequences of neglect may be particularly useful, as it helps to better understand the importance of functional injection components for engine durability.

Repair expansion and related parts

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 additional injectors, seals, or mounting hardware, check the available parts in the Audi Fuel Injector Nozzles category. For older, high-performance engines, tested components from dismantling can also be a good solution. You can find more about the advantages of this approach, repair cost optimization, and selecting used components in the article dedicated to using salvaged parts when servicing older models.

Summary

Audi RS4 B7 R8 42 Fuel Injection Injector Nozzle 4.2 FSI BNS is a solution intended for users who want to maintain the factory characteristics of the FSI engine while taking a rational approach to repair costs. A properly selected and installed injector from the Fuel Injector Nozzles group supports stable engine operation, correct load response, and predictable combustion parameters, which directly impacts the comfort and safety of vehicle operation.