Audi A6 C8 Sonda Lambda Exhaust Gas Temperature Sensor 3.0 TDI 4K0906261B

Audi A6 C8 Sonda Lambda Exhaust Gas Temperature Sensor 3.0 TDI is an original component from the Lambda sensors and O2 sensors group, designed for precise control of the mixture composition and exhaust gas temperature in the 3.0 TDI diesel engine. A properly selected sensor supports stable engine operation, reduces fuel consumption, and helps maintain the efficiency of the exhaust treatment system at the required level. This is a solution for users who expect predictable performance and compliance with Audi factory standards.

Specifications and technical data

• SKU: 4K0906261B
• Mark: Audi
• Condition: Used
• OEM Part Number: 4K0906261B
• Substitutable numbers: 4K0906261B, 4K0 906 261 B, 0281007603, 0 281 007 603, 4K0906261A, 4K0 906 261 A
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The presented component plays a dual role: it monitors the composition of exhaust gases and their temperature in a critical area of the 3.0 TDI engine exhaust system. This allows the engine control unit to continuously adjust the fuel dose, injection timing, and turbocharger operation, which translates into stable engine refinement, better throttle response, and reduced smoke emissions. A properly functioning lambda sensor with an exhaust gas temperature sensor also supports the effective operation of filters and catalytic converters, which is important during periodic inspections and emission tests.

Benefits of using an original Audi component

The original Audi component from this group is designed for the specific operating parameters of the 3.0 TDI unit, which ensures the correct measurement characteristics and predictable behavior across the entire load range. Using a factory solution allows for consistency with the controller software, reduces the risk of diagnostic errors, and avoids adaptation problems. This is particularly important in modern systems where exhaust sensors work with complex control and exhaust component warm-up strategies.

Characteristics of the used component

The item is offered as a used part, which allows for lower repair costs while maintaining the original manufacturer's specifications. Such components are a popular choice for maintenance repairs where the priority is to restore proper system operation rather than modifications or tuning. A used lambda sensor with an exhaust gas temperature sensor can be a good solution when replacing a mechanically damaged or thermally worn component, provided it is correctly matched by part number and is compatible with the specific engine version.

Selection by OEM number and interchangeable numbers

For this type of component, matching by OEM number and available interchangeable numbers is crucial, as even small differences in versions can affect measurement characteristics and compatibility with the installation. Before purchasing, it is worth verifying compatibility with the vehicle documentation or using the VIN to avoid assembly and subsequent diagnostic issues. Detailed identification data, including reference numbers, can be found in the product technical specification section.

Expert support and selection of used electronics and sensors

If you want to better understand how to safely choose used sensors and components related to control electronics, as well as how to interpret OEM markings and interchangeable numbers, the Global Parts guide will be helpful: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips on selection, compatibility, and installation of such components there.

If you are planning a comprehensive repair or upgrade of the exhaust system area in your Audi and need other elements from the same group, such as additional sensors, sensors before and after the catalytic converter, or sensors working with the particulate filter, check the available parts in the Audi Lambda sensors and O2 sensors category.