The Audi A4 B9 2.0 TDI DTNB Adblue Injector Nozzle is a component of the exhaust gas aftertreatment system in diesel engines, responsible for the precise delivery of AdBlue solution into the exhaust stream. A correctly selected injector nozzle ensures stable SCR system operation, reduction of nitrogen oxide emissions, and proper compliance with exhaust emission standards by the diesel unit.
Specifications and technical data
- SKU: 7LA131113A
- Mark: Audi
- Condition: Used
- OEM Part Number: 7LA131113A
- Substitutable numbers: 7LA131113A, 7LA 131 113 A
- Fuel type: Diesel
- Category: Fuel Injectors
Purpose and Role in the AdBlue System
The AdBlue injector nozzle in the Audi A4 B9 2.0 TDI DTNB operates in close proximity to the exhaust system, where it doses a urea solution into the exhaust gases. The quality of this component determines:
- stable AdBlue dosing under various diesel engine loads,
- correct operation of the SCR catalyst and effective NOx emission reduction,
- maintaining full functionality of the exhaust gas aftertreatment system without engine control unit errors.
A properly functioning nozzle helps avoid power loss, entry into limp-home mode, and error messages related to the emission reduction system malfunction.
Technical Characteristics and Compatibility
The presented component belongs to the category of injector nozzles and is designed for systems fueled by Diesel. Its construction is adapted to the exhaust system architecture of the Audi A4 B9 generation with a 2.0 TDI engine designated DTNB, which facilitates installation in place of the factory component.
As an Audi part, the nozzle is designed to maintain the factory operating parameters of the powertrain, including:
- correct pressure and spray pattern of the AdBlue solution,
- compatibility with the engine control unit software and SCR system control logic,
- mechanical fitment with the lines, mounts, and heat shields in the specific model.
Benefits of Using an Original AdBlue Injector Nozzle
Replacing a worn or faulty nozzle with a component that matches the factory specification restores the correct operation of the emission reduction system. Key benefits include:
- stable diesel engine operation without sudden power drops resulting from AdBlue system errors,
- reduced risk of SCR catalyst clogging due to proper solution atomization,
- maintaining compliance with exhaust emission standards, which is important during technical inspections and operation in areas with stricter environmental requirements,
- minimizing costly repairs to other exhaust system components by eliminating the root cause of the problem at the injector nozzle level.
Part Condition and Application in Service Practice
The offered AdBlue injector nozzle is a used part, making it an attractive option for users seeking a service solution with a favorable price-to-functionality ratio. This type of component is suitable for both typical SCR system repairs and preventive replacement in case of recurring AdBlue dosing errors.
Prior to installation, standard service procedures are recommended, including checking lines, connectors, and system tightness, to fully utilize the capabilities of the newly installed nozzle and ensure consistent operation of the entire exhaust gas aftertreatment system.
Technical Support and Additional Materials
If you are looking for other Audi injector nozzles for similar applications, check out our dedicated category: Audi injector nozzles. You will find a wide selection of components for various models of this brand, making it easier to choose the right part for your specific engine configuration.
To better understand the impact of injector and nozzle condition on diesel engine operation, it is worth reading the guide article Diesel Injector Faults – How to Recognize Them and What Their Neglect Entails, which discusses symptoms, consequences, and basic diagnostics of fuel supply and dosing components in diesel engines.
For those planning more extensive service work or modifications on cars of this brand, the material Audi on Used Parts – Tuning and Repairs Without Loss of Quality may also be helpful, describing a practical approach to using used components while maintaining high vehicle reliability and functionality.
