2008-2026 Audi Outside Air Temp Display TSB

Audi has issued Technical Service Bulletin (TSB) 90 24 84 2032113/9 to address customer concerns regarding the Audi outside air temperature display. This TSB, which supersedes previous bulletin 90 23-56 dated November 15, 2023, provides important information about the normal operation of the outside air temperature display in 2008-2026 Audi vehicles.

Many owners may notice that their outside air temperature display seems incorrect or slow to respond to changes. This bulletin clarifies that such behavior is often by design and does not necessarily indicate a fault with the temperature sensor.

Symptoms

Owners may report that "The outside ambient temperature display is incorrect." This can manifest as the temperature reading changing slowly, not updating as expected, or showing values that seem inconsistent with the actual ambient conditions.

How the Audi Outside Air Temperature Display Works

The Audi outside air temperature display incorporates a specific programming strategy to ensure accuracy and prevent misleading readings. The system does not instantaneously reflect every change measured by the temperature sensor. Instead, it uses a smoothening effect and specific logic to account for various driving conditions and external influences.

Key aspects of this operational logic include:

• Gradual Updates: The displayed temperature value will not change faster than 4° F (2° C) per minute. This applies to both rising and falling temperatures, ensuring a stable reading.
• Stationary Vehicle Logic: After the ignition is switched on, temperature changes are only shown after 30 seconds if the vehicle is stationary (speed is zero and the engine is switched off). This prevents immediate, potentially inaccurate readings from a parked vehicle.
• Driving Conditions: When the vehicle drives faster than 12 mph (20 km/h), only rising temperature values are displayed during the first 3 miles (5 km). This helps to filter out transient drops in temperature that might not reflect the true ambient condition.
• Falling Temperature Suppression: If the measured ambient temperature is above the displayed value but is falling, the display will not update. This prevents rapid fluctuations.
• Stop-and-Go Traffic Logic: When the engine coolant temperature reaches 104° F (40° C) and the vehicle speed drops below 12 mph (20 km/h), only falling ambient temperature values are shown. In stop-and-go traffic, where the vehicle often operates below 12 mph, it may take some time for the displayed temperature to become accurate.

Important Warnings for Owners

It is crucial for owners to understand the intended behavior of the Audi outside air temperature display. The TSB highlights two significant points:

• No Sensor Replacement Needed: "If the conditions above are noted during these typical driving scenarios, the sensor is not at fault and does not need to be replaced." This means that in most cases where the display appears slow or inconsistent, the temperature sensor is functioning correctly according to its design.
• Warranty Coverage: "This TSB is informational only and not applicable to any Audi Warranty." Owners should be aware that this bulletin serves to explain normal operation and does not cover any potential repair under warranty, as no defect is typically present.

TSB Revision History

This Technical Service Bulletin has undergone several revisions to ensure accuracy and include updated model year information:

• Revision 9: Revised Service (changed wording).
• Revision 8 (November 15, 2023): Revised header (Added MY 2025).
• Revision 7 (April 13, 2023): Revised header (Added MY 2024).

NHTSA ID: 10254035