Audi A5 F5 A4 B9 Q5 FY Diesel Exhaust Gas Temperature Sensor 05L906088BR

Audi A5 F5 A4 B9 Q5 FY Diesel Exhaust Gas Temperature Sensor is a precision exhaust system component responsible for the accurate measurement of exhaust gas temperatures. It supports the engine control unit in monitoring the combustion process and exhaust treatment system operation, which translates into stable engine performance and predictable power delivery. As a part of the Lambda sensors and O2 sensors category, it is crucial for the proper monitoring of exhaust parameters in modern Audi diesel engines.

Specifications and technical data

• SKU: 05L906088BR
• Mark: Audi
• Condition: Used
• OEM Part Number: 05L906088BR
• Substitutable numbers: 05L906088BR, 05L 906 088 BR
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in a diesel engine

The presented exhaust gas temperature sensor is designed to work with Diesel engines in Audi A5 F5, A4 B9, and Q5 FY models. Its task is to continuously measure the temperature of gases in the exhaust system and transmit this data to the engine control unit. Based on this information, the ECU can precisely control fuel dosage, boost pressure, and the operation of the exhaust treatment system, which helps maintain compliance with emission standards and stable engine operation.

A functional exhaust gas temperature sensor reduces the risk of overheating exhaust system components, supports the proper operation of the diesel particulate filter (DPF), and helps avoid limp mode caused by incorrect temperature readings. This is particularly important in modern diesel engines, where operating parameters are strictly monitored.

Benefits of using an original Audi sensor

Choosing an original Audi exhaust gas temperature sensor ensures:

• Full electrical compatibility with the vehicle's wiring and engine control unit, without the need for harness modifications.
• Stable and repeatable temperature readings, which facilitates diagnostics and reduces the risk of false errors in the ECU memory.
• Measurement characteristics matched to the specific generation of Audi engines, which is significant for DPF regeneration and emission control.

A component from this group is especially important in vehicles operated over short distances or under heavy load, where exhaust temperatures change dynamically. The correct sensor helps maintain proper exhaust system operating conditions and reduces the risk of costly failures.

Condition, origin, and service application

The offered Audi exhaust gas temperature sensor comes from disassembly and is marked as a used original part. For workshops and individual users, this means the possibility of an economical exhaust system repair while maintaining performance close to factory specifications. This type of part is often chosen as a replacement when errors related to exhaust temperature occur, or when there are problems with DPF filter regeneration or a loss of power resulting from the engine entering limp mode.

Before installation, a standard service procedure is recommended: verification of the electrical harness, inspection of connectors, and computer diagnostics after replacement to confirm the sensor's proper interaction with the engine control system.

Integration with emission control and diagnostics

As an element in the Lambda sensors and O2 sensors category, the exhaust gas temperature sensor works with other sensors in the exhaust system to create a coherent emission control system. Correct temperature readings are essential for, among other things:

• proper execution of diesel particulate filter regeneration procedures,
• protection of the turbocharger and exhaust system components from overheating,
• accurate analysis of engine operation during computer diagnostics.

Replacing a faulty sensor with a functional original part helps restore correct values in measurement blocks, which facilitates further diagnostics and allows for avoiding unnecessary replacement of other components.

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 temperature sensors, lambda sensors, or exhaust gas composition sensors, check the available parts in the Audi Lambda sensors and O2 sensors category.

Technical support and selection of used electronics

When working with exhaust measurement and engine control systems, it is worth paying attention to the correct selection of used electronic components and their compatibility with the specific vehicle version. To better understand when it is worth choosing components from disassembly and how to minimize risks during such repairs, read the guide: The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?