2021-2024 Audi MIB3 AC Favorite Lost TSB

Revision History

This Technical Service Bulletin, identified as 91 24 98 2072285/2, was issued on December 19, 2024, as Revision 2. It supersedes the previous Technical Service Bulletin Group 91 number 23-52, which was dated December 1, 2023. Revision 2 includes updates to the header, specifically regarding filters, and a revised measure release date within the service instructions. The initial publication of this bulletin was on December 1, 2023.

Symptoms of the Audi MIB3 AC Favorite Lost Issue

Owners of affected 2021-2024 Audi vehicles equipped with the MIB3 infotainment system may experience that the "air conditioner favorite on the lower screen is lost." This is the Audi MIB3 AC favorite lost issue, where quick-access settings such as "A/C MAX" or "Steering Wheel Heating" disappear from the lower display.

Despite the favorite disappearing, the functionality remains accessible. Owners can still use these climate control functions by navigating through the main "HVAC menu" on the lower screen, as illustrated in Figure 1 of the bulletin. This indicates a display or shortcut issue rather than a loss of core functionality.

Technical Background

Audi has identified the root cause of the missing favorite settings as a software issue within control unit 1 for information electronics, designated as (005F). This specific control unit is responsible for managing the infotainment system's display and various functionalities, including the climate control interface. The problem is reproducible, meaning technicians can consistently observe the favorite settings disappearing.

Important Warnings for Owners

Audi has issued specific instructions regarding this condition to prevent unnecessary repairs and costs, and to manage customer expectations for the Audi MIB3 AC favorite lost problem:

• "Do not replace any components for this condition since this will not resolve the customer's concern."
• "Replacing parts or attempting repairs will not fix the problem. Unjustified work/replacement parts will be charged back."
• "This TSB is informational only and not applicable to any Audi Warranty."

These warnings are critical. They emphasize that attempting to replace parts will not provide a solution and will not be covered under Audi's warranty.

Dealer Service Instructions

If a customer reports the Audi MIB3 AC favorite lost symptom, dealers are instructed to follow a specific procedure:

1. Customer Communication: Explain to the customer that Audi is actively working on a solution for this issue and that no repairs are necessary at this point in time.
2. No Component Replacement: Reiterate that no components should be replaced, as this will not resolve the customer's concern.
3. Timeline Information: For details regarding the timeline for the eventual solution, technicians should refer to TSB 2076404. This bulletin, titled "00 Deployment overview for customer service packages MLB and MQB for MIB3/connectivity box/OCU3/LSR," provides information on the rollout of customer service packages for various Audi platforms and systems.
4. Documentation: Dealers must create a Pending Service Solutions (PSS) record within the PSS application. This is accessed via the "Pending Service Solutions (PSS)" link found in AccessAudi, under the "Related Links >> Service" section. This documentation helps Audi track the prevalence of the issue and manage future updates.

Future Solution and Production Update

Audi is developing a permanent software solution for existing vehicles. For new vehicles, a production solution has already been implemented. All Model Year 2024 vehicles will be equipped with an information electronics control unit featuring a software version greater than 4000, which is expected to resolve this issue at the factory level.

---

Source: NHTSA ID 11012523