Lambda Sensor Audi A4 B9 Q5 8R 2.0 TDI Exhaust Probe Oxygen NOX 80A907807B

Lambda Sensor Audi A4 B9 Q5 8R 2.0 TDI Exhaust Probe Oxygen NOX is a component from the Lambda sensors and O2 sensors category, responsible for the precise measurement of nitrogen oxide levels in exhaust gases and for cooperating with the exhaust gas treatment system in diesel engines. Using an original Audi part allows you to maintain the factory performance characteristics of the 2.0 TDI unit, supporting stable engine control unit operation and the proper functioning of emission control systems.

Specifications and technical data

• SKU: 80A907807B
• Mark: Audi
• Condition: Used
• OEM Part Number: 80A907807B
• Substitutable numbers: 80A907807B, 80A 907 807 B
• Category: Oxygen Sensors

Function and role of the NOX sensor in the 2.0 TDI engine

The NOX sensor in Audi A4 B9 and Q5 8R models with the 2.0 TDI engine monitors the exhaust gas composition after the DPF filter and catalytic converter, transmitting data to the engine control unit. This enables:

• precise dosing of fuel and exhaust system additives,
• maintaining stable operating parameters of the power unit,
• limiting nitrogen oxide emissions to the level specified by the manufacturer,
• reducing the risk of the engine entering limp mode due to exhaust emission system errors.

A functional NOX sensor also supports the proper operation of the diesel particulate filter and the catalytic converter, which translates into a longer service life for the entire exhaust system.

Benefits of using an original Audi NOX lambda sensor

Using an original component from the Lambda sensors and O2 sensors category instead of a worn or damaged part allows you to maintain compliance with the factory engine control unit calibration. In practice, this means:

• stable operation at idle and under load,
• more predictable throttle response,
• reduced risk of emission-related errors,
• maintaining combustion parameters at the levels intended by the manufacturer.

A used original component is a good solution for users who want to restore the proper operation of the emission control system while maintaining reasonable maintenance costs.

Application and selection for a specific vehicle

Lambda Sensor Audi A4 B9 Q5 8R 2.0 TDI Exhaust Probe Oxygen NOX is intended for Audi vehicles equipped with the 2.0 TDI unit, which use an emission control system based on measuring nitrogen oxides in the exhaust. Before installation, it is worth verifying the part's compatibility with the specific engine version and vehicle year using the OEM part number and interchangeable numbers available in the technical specifications.

A properly selected NOX sensor reduces the risk of malfunctions in the on-board diagnostic system, incorrect readings in the engine control unit, and unnecessary costs associated with further diagnostics.

Condition, installation, and practical aspects

The offered sensor belongs to the group of used parts, which allows for an economical repair of the emission control system while maintaining the original design of the component. Before installation, a standard check of the electrical wiring and connectors is recommended, as well as computer diagnostics after replacement to confirm proper communication with the control unit.

In practice, replacing the NOX sensor is often a key step in clearing errors related to exhaust emissions, power loss, or increased fuel consumption. A properly functioning sensor supports the maintenance of stable engine operating parameters and can limit the need for costly interventions in other exhaust system components.

More about used electronics and sensors in the car

If you want to better understand when choosing used electronic components – such as engine control units, comfort modules, or sensors – is a reasonable solution, check out the practical tips in the article: The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?

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 lambda sensors, O2 sensors, or related exhaust control sensors, check the available parts in the Audi Lambda sensors and O2 sensors category.