The Audi Q7 4L A8 D4 4.2 TDI Diesel Injector Nozzle is an original injector nozzle designed for 4.2 TDI diesel engines in premium Audi models. This component ensures precise diesel fuel metering, stable engine operation, and proper combustion parameters under demanding operating conditions.
Specifications and technical data
- SKU: 057130277AM
- Mark: Audi
- Condition: Used
- OEM Part Number: 057130277AM
- Substitutable numbers: 057130277AM, 057 130 277 AM
- Fuel type: Diesel
- Category: Fuel Injectors
Purpose and Technical Characteristics
The presented 4.2 TDI diesel engine fuel injector belongs to the injector nozzles category and has been designed for Audi Q7 4L and Audi A8 D4 diesel engines. The injector's design is adapted to the specifics of V8 TDI engines, where precise fuel spray formation and dose repeatability across the full load range are crucial.
As a component of the Diesel fuel supply system, the injector works with the high-pressure pump and common rail, responsible for:
- accurate fuel metering in each cylinder's working cycle,
- optimal diesel atomization in the combustion chamber,
- maintaining engine smoothness at low and high RPMs,
- reducing smoke and exhaust emissions due to the correct spray pattern.
Benefits of Using an Original Injector Nozzle
Using a factory injector nozzle in a 4.2 TDI engine translates into a range of practical operational benefits:
- Stable engine operation – uniform fuel metering reduces vibrations and uneven idling.
- Improved throttle response – proper injection supports dynamic acceleration, especially in heavy SUVs and sedans.
- Protection of cooperating components – correct combustion reduces the load on the DPF filter, turbocharger, and exhaust system.
- Maintaining original power parameters – correct pressure and spray pattern help preserve the performance declared for the 4.2 TDI engine.
For demanding Audi users, it is important that an original injector nozzle is designed for the specific characteristics of the engine, minimizing the risk of problems with ECU adaptation and calibration.
Component Condition and Service Application
The offered injector is a used part, making it an attractive service solution for users seeking a compromise between cost and quality. Such components are often chosen for:
- individual cylinder repairs, when symptoms indicate a problem with a single injector,
- gradual regeneration of the injection system, when the user replaces components in stages,
- restoring diesel engine efficiency after prolonged operation on lower quality fuel.
Due to the nature of the common rail system, before installation, computer diagnostics and verification of injector operating parameters on a test bench are recommended to ensure proper fuel dose balance between cylinders.
Diagnostics and Prevention of the Injection System
For Audi 4.2 TDI diesel engines, it is crucial to quickly recognize the first symptoms of injector wear, such as starting difficulties, power loss, or increased exhaust smoke. A detailed discussion of symptoms and potential consequences of neglect can be found in the article: Diesel Injector Failures – How to Recognize Them and What Neglecting Them Entails. This is a practical source of knowledge that helps make the decision to replace or regenerate injector nozzles at the right time.
Other Audi Injector Nozzles
If you are looking for other Audi injector nozzles for different engine versions or models of this brand, check out our dedicated category: Audi Injector Nozzles. There you will find a wide selection of injection system components tailored to various generations and configurations of diesel engines.
Summary
The Audi Q7 4L A8 D4 4.2 TDI Diesel Injector Nozzle is a technically matched injector nozzle for demanding V8 TDI diesel engines. A properly selected component helps maintain proper combustion parameters, engine smoothness, and performance, while also reducing the risk of costly failures of other powertrain components. It is a sensible choice for users who want to service their injection system consciously and in accordance with Audi's design principles.
