Audi A4 B9 A5 F5 Exhaust Temperature NOX Sensor 2.0 TDI Diesel 8W0907807T

Audi A4 B9 A5 F5 NOx Sensor Exhaust Temperature 2.0 TDI Diesel is a precise exhaust system component responsible for reliable measurement of nitrogen oxides and exhaust gas temperature in diesel engines. Thanks to it, the engine control unit can effectively manage the powertrain and exhaust gas purification system, which translates into stable performance and reduced emissions. This solution is dedicated to modern Diesel engines, where measurement accuracy is crucial for the durability of components.

Specifications and technical data

• SKU: 8W0907807T
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0907807T
• Substitutable numbers: 8W0907807T, 8W0 907 807 T, 0281007867, 0281007868
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and Function of the NOx / Exhaust Temperature Sensor

The presented sensor operates in the Lambda Sensors and O2 Sensors category, but unlike a classic lambda sensor, it is responsible for measuring both NOx concentration and exhaust gas temperature in a diesel engine. It is installed in the exhaust system, where it continuously monitors gas composition and thermal conditions, providing the engine control unit with data necessary for:

• correct fuel delivery in the diesel engine,
• controlling the exhaust gas purification system (e.g., catalytic converter and particulate filter),
• maintaining stable engine operation under various load conditions,
• reducing the emission of harmful compounds in exhaust gases.

In Audi vehicles with 2.0 TDI Diesel engines, a properly functioning NOx and exhaust temperature sensor directly impacts the engine's smoothness, fuel consumption, and the lifespan of exhaust system components.

Compatibility and Identification by OEM

The offered part is from the range of original solutions used by Audi and is intended for A4 B9 and A5 F5 models with diesel engines. Identification by OEM part number and available interchangeable numbers allows for selecting the sensor according to the requirements of a specific vehicle configuration, minimizing the risk of installation and communication problems with the car's electronics.

To ensure compatibility, it is advisable to compare the markings with the service documentation or use VIN-based selection. This will ensure the sensor works with the existing engine control unit and exhaust system without requiring installation modifications.

Operating Characteristics in Diesel Engines

In Diesel engines, the NOx and exhaust temperature sensor operates in a demanding environment – with high temperatures and variable gas composition. The applied measurement design enables:

• continuous reading of nitrogen oxide concentration in the exhaust stream,
• monitoring of temperature in a critical section of the exhaust system,
• real-time data transmission to the control unit,
• adaptation of injection strategies and exhaust gas purification system operation to current driving conditions.

A functional sensor of this type helps reduce diagnostic system errors, limp mode activation, and power drops resulting from incorrect exhaust parameter readings.

Condition, Advantages of Using a Used Part, and Practical Tips

The offered sensor is a used part, allowing for economical exhaust system repair while maintaining proper operating parameters. For this type of component, it is crucial to verify before installation:

• the compatibility of markings with the previously installed sensor,
• the fuel type – in this case, dedicated to diesel engines,
• the type of exhaust gas purification system used in the vehicle.

A correctly selected and functional NOx / exhaust temperature sensor allows for restoring proper exhaust system operation, reducing the risk of particulate filter clogging, and minimizing emission-related errors.

Related Parts and Additional Technical Information

If you are planning a comprehensive repair or upgrade of the exhaust system area in your Audi and need other parts from the same group, such as additional exhaust gas sensors, control probes, or measurement elements in the exhaust path, check the available parts in the Audi Lambda Sensors and O2 Sensors category.

When selecting and installing used sensors and other measurement electronics, it is advisable to follow proven workshop procedures and select based on OEM numbers and technical parameters. A detailed discussion of selection principles, compatibility verification, and practical application examples can be found in the guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?