Audi A4 B9 A5 F5 Exhaust Gas Temperature Sensor 2.0 TDI 04L919529E

Audi A4 B9 A5 F5 Exhaust Gas Temperature Sensor 2.0 TDI is an original exhaust system component designed for precise monitoring of exhaust gas temperatures in diesel engines. Thanks to its factory-fit design for Audi A4 B9 and Audi A5 F5 models with the 2.0 TDI engine, it ensures stable integration with the engine control electronics. This is a practical solution for users looking to restore the correct operating parameters of the injection and exhaust aftertreatment systems while maintaining high compliance with factory specifications.

Specifications and technical data

• SKU: 04L919529E
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L919529E
• Substitutable numbers: 04L919529E, 04L 919 529 E
• Category: Other Exhaust & Emission Parts

Purpose and function of the exhaust gas temperature sensor

The exhaust gas temperature sensor in the 2.0 TDI engine is responsible for real-time measurement of exhaust gas temperatures and transmitting this data to the engine control unit. Based on this information, the control unit adjusts the fuel dosage, turbocharger operation, and the regeneration strategy of the exhaust aftertreatment system. A properly functioning component of this type helps maintain stable engine performance, reduces the risk of component overheating, and supports compliance with emission standards.

In the event of incorrect readings from the sensor, errors may appear in the control unit, leading to power loss, increased fuel consumption, or problems with exhaust system regeneration. Replacing it with a functional, original component is therefore an essential step when diagnosing faults related to exhaust gas temperature.

Benefits of using an original Audi component

By using an original Audi exhaust gas temperature sensor, you gain the certainty of a proper fit for the thread, cable length, and electrical connector for the installation in Audi A4 B9 and Audi A5 F5 models with the 2.0 TDI engine. This reduces the risk of installation issues and eliminates the need for wiring modifications or adapters. The correct measurement characteristics ensure consistency with the engine control unit maps, which translates into predictable engine behavior under various load and temperature conditions.

Stable temperature readings help maintain the proper operation of the turbocharger and exhaust system components, which is important for both component durability and driving comfort. Choosing an original component is particularly important in vehicles where parameter repeatability and compliance with factory settings are prioritized.

Installation and operational characteristics

The exhaust gas temperature sensor is installed in the exhaust system at the location specified by the vehicle manufacturer. Thanks to the factory design intended for the Audi A4 B9 and Audi A5 F5 with the 2.0 TDI engine, the installation process is straightforward, maintaining the original cable routing and proper connector positioning. In practice, this translates into:

• a secure electrical connection with the vehicle's wiring,
• correct positioning of the measuring element in the exhaust stream,
• preservation of the factory exhaust system seal.

The item in this offer comes from dismantling, making it an attractive cost-effective alternative to new parts while maintaining the original manufacturer's specifications. This solution is particularly beneficial for maintenance repairs where technical efficiency and compliance with the factory design are the priority.

Application in Audi service and diagnostics

In service practice, the exhaust gas temperature sensor is often replaced after diagnosing errors related to exhaust gas temperature or improper operation of the exhaust aftertreatment system. In Audi A4 B9 and Audi A5 F5 vehicles with the 2.0 TDI engine, using an original component helps shorten secondary diagnostic time, as it eliminates the variable of uncertain quality aftermarket replacements. This facilitates workshop operations and reduces the risk of the vehicle returning with the same fault.

For users interested in the structural differences between various Audi model versions, including sports variants, a valuable addition to your knowledge will be an article describing the characteristics of engines and chassis – details can be found in the material Audi RS vs other models – what is hidden under the hood and chassis?.

System expansion and selection of other components

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 additional sensors, wiring, or mounts, check out the available parts in the Other Audi category.

For more extensive projects, such as retrofitting VAG group cars with elements from higher trim levels, it is worth reading the guide on the smart use of parts from dismantling – practical tips can be found in the article Retrofitting in VAG and BMW group cars – how to upgrade your car cheaply.