Audi Q5 8R Nox Nitrogen Oxide Lambda Sensor Control 8R0907807G

The Audi Q5 8R Nox Nitrogen Oxide Lambda Sensor Control is a specialized control module for the nitrogen oxide sensor in the exhaust system, designed for use in Audi vehicles. This component is responsible for precise exhaust gas composition control and works in conjunction with the lambda sensor, which is crucial for the proper functioning of the engine and the exhaust gas purification system. A used module offers a sensible, technically justified solution for emission system repairs in Q5 family cars.

Specifications and technical data

• SKU: 8R0907807G
• Mark: Audi
• Condition: Used
• OEM Part Number: 8R0907807G
• Substitutable numbers: 8R0907807G, 8R0 907 807 G
• Category: Oxygen Sensors

Function and Role in the Exhaust System

The presented NOx controller works with the nitrogen oxide sensor and the lambda sensor, analyzing exhaust gas composition and transmitting data to the main engine control unit. This enables:

• continuous monitoring of nitrogen oxide levels in the exhaust stream,
• adjustment of fuel injection and engine operating parameters,
• cooperation with the exhaust gas purification system (including the catalytic converter),
• compliance with the emission standards specified for the particular model.

A functional control module within the Lambda Sensors and O2 Sensors group reduces the risk of engine control unit errors, limp mode activation, and power loss resulting from incorrect exhaust gas composition readings.

Benefits of Using an Original Audi Module

An original component designed for Audi vehicles ensures proper electrical and logical compatibility with the vehicle's factory installation. In practice, this means:

• correct communication with the vehicle's bus system and engine control unit,
• retention of factory emission control strategies,
• stable system operation over a long service life,
• reduced risk of software compatibility issues.

For the user, this translates to more predictable exhaust system operation, a lower risk of warning lights illuminating, and maintained proper engine operating parameters under typical driving conditions.

Module Application in Service Practice

The NOx control module is particularly important in vehicles used for long distances, where the exhaust gas purification system operates across a wide range of temperatures and loads. Replacing this component is recommended in situations where:

• recurring errors related to the NOx sensor or lambda sensor occur,
• the vehicle enters limp mode with reduced power,
• computer diagnostics indicate incorrect operation of the NOx sensor controller,
• it is necessary to restore proper emission system function after previous repairs.

A used component allows for optimization of repair costs while maintaining the original system design and its operating logic.

Condition and Selection of the Appropriate Component

The offered module is a used item, which in the case of automotive electronics often represents a favorable compromise between price and functionality. Before installation, it is recommended to verify compatibility by OEM number and interchangeable part numbers, as well as to consult with a diagnostician or mechanic to confirm correct selection for the specific engine version and vehicle year.

To better understand how to safely choose used control units and sensors, it is worth reading the guide describing selection by numbers, hardware and software compatibility, and practical installation examples: Used Automotive Electronics – Second-Hand ECU Modules and Sensors.

Expansion of the Exhaust Gas Measurement System in Audi

If you are planning a comprehensive repair or upgrade of the exhaust system area in your Audi and require other components from the same group, such as additional lambda sensors, oxygen sensors, or exhaust gas composition control modules, check the available parts in the Audi Lambda Sensors and O2 Sensors category.