Audi A4 B9 A7 4G Q7 4M Exhaust Gas Temperature Sensor Diesel 4M0906088BA

Audi A4 B9 A7 4G Q7 4M Exhaust Gas Temperature Sensor Diesel is an original component from the Lambda sensors and O2 sensors group, designed for Audi diesel systems. Precise exhaust gas temperature measurement is crucial for the proper operation of the exhaust gas treatment system, turbocharger protection, and stable injection strategy in Diesel engines.

Specifications and technical data

• SKU: 4M0906088BA
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0906088BA
• Substitutable numbers: 4M0906088BA, 4M0 906 088 BA
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The exhaust gas temperature sensor in a diesel engine is responsible for continuous monitoring of operating conditions within the exhaust system. Based on its signal, the engine control unit adjusts the fuel dose, turbocharger operation, and regeneration strategies for filters and exhaust treatment components. A properly functioning sensor reduces the risk of component overheating, supports stable engine performance, and helps maintain compliance with emission standards.

Benefits of using an original Audi sensor

Choosing a component from the Lambda sensors and O2 sensors group dedicated to specific Audi models allows for maintaining the factory operating characteristics of the engine control system. The original sensor ensures:

• signal consistency with the maps stored in the engine control unit,
• stable measurement parameters across the full range of operating temperatures,
• proper cooperation with on-board diagnostic systems.

As a result, you reduce the risk of errors in the controller's memory, uneven engine operation, or incorrect regeneration procedures for exhaust system components.

Technical characteristics and compatibility

The presented sensor is intended for Diesel engines in selected Audi models, including the A4, A7, and Q7 series. As an original Audi family component, it has been designed to work with factory wiring, connectors, and control software, which facilitates installation and subsequent diagnostics. The presence of dedicated part numbers and interchangeable numbers allows for precise compatibility verification via VIN or manufacturer markings.

Product condition and service application

The offered exhaust gas temperature sensor is a used item, making it an attractive cost-effective alternative to a new OEM component while maintaining proper functionality. This type of solution is particularly effective for maintenance repairs where the priority is to restore proper exhaust system operation within a reasonable service budget. Replacing a faulty sensor with a functional original component helps reduce the risk of turbocharger failure, excessive filter load, and incorrect readings in computer diagnostics.

Selection, installation, and technical support

Before purchasing, it is worth verifying the sensor's compatibility with the specific engine version and vehicle model year using the part number, reference numbers, or Audi catalog data. A properly selected component allows for plug-and-play style installation without the need for electrical system modifications. For users who want to make informed choices when selecting used electronic and measurement components, the Global Parts guide will be useful – Used automotive electronics on board – why choose second-hand ECU modules and sensors?, which discusses topics such as selection by VIN/OEM, compatibility issues, and practical application examples.

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 temperature sensors, measuring probes, or control elements, check the available parts in the Audi Lambda sensors and O2 sensors category.