Audi RS3 8Y RSQ3 F3 Engine Fuel Injector Nozzle Set x4 2.5 TFSI 07K133551A

Audi RS3 8Y RSQ3 F3 Engine Fuel Injector Nozzle Set x4 2.5 TFSI is a set of four precision components from the Fuel injector nozzles group, designed for 2.5 TFSI petrol engines in sporty Audi RS3 8Y and RSQ3 F3 models. The set provides a practical service solution for users looking to restore correct fuel delivery and stable engine operation while maintaining factory specifications.

Specifications and technical data

• SKU: 07K133551A
• Mark: Audi
• Condition: Used
• OEM Part Number: 07K133551A
• Substitutable numbers: 07K133551A, 07K 133 551 A, 07K 133 551 B, 07K133551B
• Fuel type: Petrol
• Part type: Fuel Injector
• Category: Fuel Injectors

Purpose and function of the injector set

The presented set includes four petrol injectors dedicated to 2.5 TFSI units used in Audi RS3 8Y and RSQ3 F3 models. Each nozzle is responsible for the precise atomization of fuel in the combustion chamber, which is crucial for stable engine operation, proper throttle response, and maintaining appropriate exhaust emission parameters. Replacing the complete set of injectors is particularly recommended in cases of noticeable engine performance issues, cold start difficulties, power loss, or unstable idle speed. Using the x4 set allows for an even refresh of the entire injection system, which facilitates subsequent diagnostics and reduces the risk of performance discrepancies between individual cylinders.

Benefits of using original Audi injector nozzles

Original Audi injector nozzles are designed with the specific requirements of high-power engines, such as the 2.5 TFSI, in mind. This ensures that the correct spray pattern is maintained, allowing the engine control unit to operate within the parameters intended by the manufacturer. This translates into:

• stable fuel delivery across the full load range,
• more predictable throttle response,
• easier maintenance of factory ignition and boost maps,
• reduced risk of engine knocking resulting from improper fuel atomization. For users of performance-oriented vehicles, it is also important that using dedicated injectors helps maintain consistent performance, which is significant both in daily driving and during intensive track use.

Technical and fuel characteristics

The set is designed to work with a fuel system based on petrol. Proper selection of flow parameters and spray angle is crucial for 2.5 TFSI engines, where the precision of fuel delivery affects boost efficiency, exhaust gas temperature, and the durability of internal engine components. Injectors in this group are adapted to operate under demanding thermal and pressure conditions typical of modern turbocharged engines. With proper installation and engine control unit calibration, they can ensure long-term, repeatable operation of the injection system, which is particularly important in vehicles driven dynamically.

Condition, installation, and service aspects

The offered set comes from the used parts segment, which is a cost-effective solution while maintaining the manufacturer's original specifications. Before installation, standard service procedures are recommended, such as leak testing, checking performance on a diagnostic bench, and replacing seals in accordance with workshop procedures. During installation, it is worth paying attention to:

• thorough cleaning of the seats in the cylinder head,
• using new sealing elements in accordance with the manufacturer's recommendations,
• correct tightening torque for the mounts,
• subsequent verification of engine operating parameters using a diagnostic tester (fuel trim corrections, injection time, adaptations). This approach allows for fully utilizing the potential of the set and reducing the risk of needing to intervene in the fuel supply system again.

Technical support and additional information

Improper injector operation, even in petrol engines, often presents symptoms similar to those known from diesel units – uneven operation, smoke, power loss, or increased fuel consumption. To better understand the mechanisms of failures and their consequences for the engine, it is worth reading an article describing the symptoms and effects of injector damage in diesel engines: diesel injector faults – symptoms and diagnostics. If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other components from the same group, such as additional injectors, mounting hardware, or fuel system seals, check the available parts in the Audi injector nozzles category.