Audi A4 B9 A5 F5 NOx Sensor 2.0 TDI Diesel 8W0907807BE

Audi A4 B9 A5 F5 NOx Sensor 2.0 TDI Diesel is a component from the Lambda probes and O2 sensors group, responsible for the precise measurement of nitrogen oxides in the exhaust system of a diesel engine. A properly functioning NOx sensor supports the efficient operation of the exhaust gas treatment system, stable engine performance, and compliance with emission standards.

Specifications and technical data

• SKU: 8W0907807BE
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0907807BE
• Substitutable numbers: 8W0907807BE, 8W0 907 807 BE
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The NOx sensor in Audi A4 B9 and A5 F5 models with a 2.0 TDI Diesel engine works in direct connection with the exhaust gas treatment system, including the catalytic converter and the nitrogen oxide reduction system. Based on the signal from the sensor, the engine control unit adjusts the fuel dosage, the operation of the injection system, and the regeneration strategy for components responsible for emission reduction. A stable NOx reading translates into:

• more consistent engine performance under various load conditions,
• maintaining the correct mixture in the context of exhaust emissions,
• reducing the risk of the engine entering limp mode due to emission-related errors.

Benefits of using an original Audi sensor

The original NOx sensor from the Lambda probes and O2 sensors group is designed for the specific electrical and software architecture of Audi vehicles. As a result, it ensures:

• signal consistency with the requirements of the engine control unit,
• appropriate operating characteristics across the full temperature range of the exhaust system,
• compatibility with factory OBD diagnostic strategies. In practice, this means fewer issues with error codes in the controller memory, better repeatability of operating parameters, and greater predictability of vehicle behavior after installation.

Installation and operational characteristics

The NOx sensor designed for 2.0 TDI Diesel units works with the vehicle's electrical system via a dedicated connector and is integrated with a measurement electronics module. Proper installation requires maintaining the correct position in the exhaust system and correctly routing the wiring harness to avoid overheating the wires and signal interference. When replacing, it is worth paying attention to:

• the cleanliness of the mounting socket in the exhaust system,
• checking the condition of the electrical harness in the sensor area,
• correct tightening of the component according to the manufacturer's service recommendations. This approach promotes longer and more stable sensor operation and reduces the risk of recurring emission-related errors.

Product condition and economic aspect

The presented NOx sensor is a used component, which provides an attractive solution for users looking for a compromise between repair costs and maintaining the vehicle's original specifications. Choosing tested used electronics allows for lower service costs while maintaining the proper functionality of the exhaust system. If you want to better understand how to safely select and install used modules and sensors in a car, it is worth checking out our guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips there regarding selection by identification numbers, compatibility, and installation procedures.

Expanding the exhaust measurement system in Audi

If you are planning a comprehensive repair or upgrade of the exhaust and emission control area in your Audi and need other components from the same group, such as additional oxygen sensors, control probes, or diagnostic probes, check the available parts in the Audi Lambda probes and O2 sensors category.