Audi S3 8V Q5 8R Petrol Coolant Temperature Sensor 079919523B

Audi S3 8V Q5 8R Petrol Coolant Temperature Sensor is a precision component from the Air and fuel intake sensors group, responsible for the accurate reading of coolant temperature in a petrol engine. A properly functioning sensor supports stable engine operation, optimizes fuel dosage, and influences engine performance under various load conditions.

Specifications and technical data

• SKU: 079919523B
• Mark: Audi
• Condition: Used
• OEM Part Number: 079919523B
• Substitutable numbers: 079919523B, 079 919 523 B
• Fuel type: Petrol
• Category: Air Intake & Fuel Sensors

The role of the coolant temperature sensor in a petrol engine

The presented sensor operates within the petrol engine management system, transmitting information about the current coolant temperature to the ECU. Based on this data, the engine management system adjusts:

• fuel dosage during the start-up and warm-up phases,
• ignition timing across various RPM ranges,
• radiator fan operation and the engine's thermal protection strategy.

A functional temperature sensor reduces the risk of overheating, rough idling when cold, and increased fuel consumption, which translates into more stable and predictable vehicle operation.

Benefits of using an original Audi sensor

The original coolant temperature sensor designed for Audi models ensures compliance with the factory engine management system characteristics. As a result:

• the ECU receives a reliable temperature signal with the correct resistance characteristics,
• proper interaction with injection and ignition maps is maintained,
• compatibility with the electrical system and factory connector is preserved.

For petrol engines, stability of operating parameters during the warm-up phase is particularly important, which is why using the correct sensor has a direct impact on driving comfort and engine durability.

Component condition and installation aspects

The offered sensor is a used part from disassembly, allowing for an economical repair while maintaining the manufacturer's original specifications. Before installation, it is recommended to perform a standard inspection of the socket in the radiator or engine block, check the seal, and verify the condition of the electrical wiring harness.

In practice, replacing the coolant temperature sensor is a service task of moderate difficulty; however, to ensure the safety of the cooling system, it is worth ensuring the system is properly bled after the work is completed.

Selection, compatibility, and technical support

To select the correct sensor for a specific version of the Audi S3 8V or Q5 8R, it is crucial to consider the petrol engine type and manufacturer markings. In case of doubt, it is recommended to select the part by OEM number or the vehicle's VIN to minimize the risk of electrical or mechanical incompatibility.

If you would like to learn more about selecting and installing used electronic components and sensors, it is worth checking out the guide: Used automotive electronics – how to safely choose ECU modules and sensors. There, you will find practical tips regarding compatibility, interpretation of markings, and the most frequently asked questions related to installation.

Expanding the measurement system in an Audi

If you are planning a comprehensive repair or upgrade of your Audi's engine area and need other components from the same group, such as additional temperature sensors, pressure sensors, or flow measurement elements, check out the available parts in the Audi air and fuel intake sensors category.

Additional arguments for choosing proven, used components are provided in the guide: Used car parts – myths and facts worth knowing before you buy, which discusses the real benefits, limitations, and principles of safely using second-hand parts.