Audi Q3 8U 2.0 TDI CUWA Exhaust NOX Lambda Oxygen Sensor 04L907805L

Audi Q3 8U 2.0 TDI CUWA Exhaust NOX Lambda Oxygen Sensor is a component from the Lambda sensors and O2 sensors group, designed for Audi diesel systems. It enables precise monitoring of exhaust gas composition in a diesel engine, supporting the proper operation of the exhaust treatment system and stable engine performance. This is a technical solution that helps maintain exhaust system efficiency and compliance with emission requirements.

Specifications and technical data

• SKU: 04L907805L-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L907805L
• Substitutable numbers: 04L907805L, 04L 907 805 L
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The presented NOX sensor with lambda probe functionality operates in the diesel engine exhaust system, monitoring the content of nitrogen oxides and oxygen in the exhaust gases. This allows the engine control unit to properly adjust the fuel dose and the operation of the exhaust treatment system, which translates into stable engine performance and reduced smoke. For 2.0 TDI diesel units, such a component is essential for the correct operation of the fuel injection system and emission reduction systems.

Benefits of using a dedicated NOX sensor

Using a dedicated NOX sensor in an Audi allows for consistency with the factory engine control unit calibration. A properly selected component:

• supports the maintenance of correct combustion parameters in a diesel engine,
• helps reduce fuel consumption through precise monitoring of the mixture composition,
• contributes to the correct operation of filters and emission reduction systems,
• reduces the risk of emission-related errors appearing in the controller's memory.

For the user, this means more predictable vehicle behavior and a lower probability of the engine entering limp mode due to incorrect readings from the exhaust system.

Component characteristics and vehicle fitment

The sensor belongs to the Lambda sensors and O2 sensors group, meaning it works continuously with the engine control system, providing information about exhaust gas composition. In the case of diesel units, this is of particular importance because the exhaust treatment system is more complex than in many gasoline engines. Properly matching the component to a specific Audi model ensures compatibility with the electrical harness and controller software.

The product comes from the Audi OE segment, which promotes the maintenance of factory operating parameters and proper communication with the vehicle's electronics. For workshops and users, this means easier integration with the existing installation and predictable behavior after installation.

Condition, application, and practical aspects

The offered component is in used condition, which allows for an economical approach to exhaust system repair while maintaining proper functionality. In practice, such a sensor can be used both when replacing a damaged part and during broader service work related to the diesel exhaust emission system. It is recommended to entrust the installation to a service center with experience in Audi electronics to ensure proper tightening, connection, and potential adaptation in the controller.

A properly functioning NOX sensor with lambda probe functionality helps reduce the risk of costly failures of associated components, such as filters or other exhaust system parts, because the controller receives reliable data to manage the combustion process.

System expansion and electronics selection

When working with engine electronics and the exhaust emission system, it is worth paying attention to the consistency of all modules, controllers, and sensors. Practical tips on selecting used automotive electronics may be helpful – you can find them in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which discusses, among other things, the issues of compatibility and cost-effectiveness of such solutions.

Related components from the same group

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 probes, oxygen sensors, or NOX sensors, check the available parts in the Audi Lambda sensors and O2 sensors category.