Audi A6 C7 A7 4G8 NOx Sensor Lambda Probe Sender 3.0 TDI Diesel CRTE 4G0907807H

Audi A6 C7 A7 4G8 NOx Sensor Lambda Probe Sender 3.0 TDI Diesel CRTE is a specialized component from the Lambda probes and O2 sensors category, responsible for the precise measurement of nitrogen oxides in the exhaust system of a diesel engine. A properly functioning NOx sensor is crucial for the stable operation of the 3.0 TDI unit, correct fuel dosage, and the efficient performance of exhaust gas treatment systems in modern Audi models.

Specifications and technical data

• SKU: 4G0907807H
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0907807H
• Substitutable numbers: 4G0907807H, 4G0 907 807 H, 4G0 907 807 AJ, 4G0907807AJ
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function of the NOx sensor

The NOx sensor in Audi A6 C7 and A7 4G8 models with a 3.0 TDI diesel engine operates in the exhaust stream, monitoring the level of nitrogen oxides after the treatment system. Based on its signal, the engine control unit adjusts the fuel dosage, injection system operation, and emission reduction strategy, which translates into stable power, smooth engine operation, and compliance with emission standards. Thanks to the use of a dedicated NOx sensor, the exhaust system maintains proper operating parameters, and the onboard diagnostic system can reliably detect emission-related irregularities. This is particularly important in modern diesel units, where the cooperation of sensors with control electronics has a direct impact on engine performance and fuel consumption.

Benefits of using an original Audi sensor

Using a component from the Lambda probes and O2 sensors category dedicated to a specific 3.0 TDI engine configuration ensures proper measurement characteristics and compatibility with the control unit software. A properly selected NOx sensor helps to:

• maintain correct combustion parameters in the diesel engine,
• minimize the risk of the unit entering limp mode due to emission errors,
• reduce excessive fuel consumption resulting from incorrect mixture corrections,
• ensure the correct operation of exhaust gas treatment systems in the long term. In the case of 3.0 TDI diesel units, where the exhaust system is complex and highly integrated with electronics, the use of the correct NOx sensor is significant for both driving parameters and the durability of other system components.

Product characteristics and condition

The offered NOx sensor comes from an Audi vehicle and is a used part, which allows for an economical repair of the exhaust system while maintaining proper functionality. Such electronic components, sourced from dismantling, are frequently chosen for servicing modern diesels because they enable the restoration of correct system operation without the need to invest in a brand-new part. Due to the specific operating conditions of NOx sensors in diesel units, it is essential to match the component to the specific engine version and control unit software. In practice, this means the necessity of verifying compatibility by OEM number or interchangeable numbers – these details are available in the technical specifications section and allow for an informed selection of the component for a given Audi A6 C7 or A7 4G8.

Selection, installation, and technical aspects

When replacing the NOx sensor in a 3.0 TDI diesel engine, it is crucial to maintain the correct installation location in the exhaust system and properly route the electrical harness. In many cases, after installation, it is recommended to perform an adaptation or clear errors in the engine control unit using an appropriate diagnostic tester so that the new component is correctly recognized by the system. It is worth noting that NOx sensors belong to a group of advanced measuring elements operating at high temperatures and in an exhaust environment. For this reason, their correct operation has a direct impact on:

• the stability of the engine unit under various loads,
• maintaining an appropriate emission level in urban and highway conditions,
• reducing the risk of emission system fault messages appearing on the instrument cluster.

Expert support and additional information

If you want to better understand when choosing a used NOx sensor makes sense, how to properly select it by OEM number, and what to pay attention to during installation and diagnostics, check out our guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. This is a practical source of knowledge about selecting and operating used electronic components in modern vehicles. If you are planning a comprehensive repair or upgrade of the exhaust and emission control area in your Audi and need other elements from the same group, such as lambda probes, additional oxygen sensors, or exhaust gas temperature sensors, check out the available parts in the Audi lambda probes and O2 sensors category.