Audi A4 B9 A5 F5 A6 C7 A7 4G Exhaust Gas Temperature Sensor 3.0 TDI 4M0906088AN

Audi A4 B9 A5 F5 A6 C7 A7 4G Exhaust Gas Temperature Sensor 3.0 TDI is a precision exhaust system component responsible for the accurate measurement of exhaust gas temperatures in diesel engines. Thanks to reliable readings of engine operating parameters, it supports the proper functioning of engine control and exhaust gas treatment systems. This solution is designed for users who expect stable diesel engine performance and seamless integration with the vehicle's electronics.

Specifications and technical data

• SKU: 4M0906088AN
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0906088AN
• Substitutable numbers: 4M0906088AN, 4M0 906 088 AN, 4M0906088AB, 4M0 906 088 AB
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function of the exhaust gas temperature sensor

The presented exhaust gas temperature sensor is a component of the emission control system in 3.0 TDI engines used in modern Audi models. Its task is to monitor gas temperatures in the exhaust system, which allows the engine control unit (ECU) to properly manage fuel dosage, turbocharger operation, and exhaust gas treatment processes. A properly functioning sensor helps maintain stable engine operating parameters, reduces the risk of overheating exhaust components, and supports compliance with emission standards.

Thanks to precise measurement, the sensor influences areas such as:

• temperature control in the exhaust system under high engine load,
• proper operation of the ECU's protective strategies,
• maintaining optimal operating conditions for exhaust gas treatment components.

Category: Lambda probes and O2 sensors – role in the exhaust system

The product belongs to the Lambda probes and O2 sensors category, a group of components responsible for measuring exhaust parameters and transmitting them to the engine control unit. The cooperation of the exhaust gas temperature sensor with other sensors in this category enables the ECU to precisely correct the fuel mixture and operating conditions of the diesel engine. This is particularly important in 3.0 TDI units, where high efficiency and proper torque characteristics require precise monitoring of exhaust temperature and composition.

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

Benefits of using an original sensor in a diesel engine

Diesel engines are particularly sensitive to the quality of sensor signals, which is why using a dedicated exhaust gas temperature sensor in a diesel unit has a direct impact on engine refinement and component durability. A properly selected component helps to:

• maintain stable engine operating parameters under variable loads,
• minimize the risk of ECU errors related to incorrect temperature readings,
• preserve proper exhaust system operating conditions in the long term.

For the user, this means more predictable vehicle behavior, a reduced risk of the engine entering limp mode, and better cooperation with the rest of the vehicle's electronics. In the case of 3.0 TDI units, this is of particular importance during highway driving and under high loads, where exhaust temperatures reach high values.

Used condition and practical selection aspects

The offered exhaust gas temperature sensor is a used component, which allows for an economical restoration of exhaust system efficiency while maintaining original operating characteristics. This type of solution is often chosen for repairs where matching the factory installation and maintaining compatibility with the existing engine control unit is crucial.

Before purchasing, it is worth comparing the markings with the damaged component and verifying compatibility with the specific version of the diesel engine in your car. This ensures the sensor can be installed without additional modifications and its operation will be consistent with the parameters stored in the ECU.

More about used electronics and sensors in a car

When selecting used electronic components and sensors in modern cars, it is worth considering not only the price but also the compatibility and origin of the part. If you want to better understand when choosing used components is technically justified and how to select them safely, see the article: The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?