2021-2026 Audi Thermostat Part Update SM 58-2025

Understanding Audi Special Notice SM 58-2025

Audi has issued Special Notice SM 58-2025, an internal communication to its parts managers regarding an update to thermostat part numbers. This notice, dated November 11, 2025, is primarily concerned with managing dealership inventory to ensure that only the most current and correct parts are available for service and repair.

This type of communication, often referred to as a Parts Circular, is a standard practice in the automotive industry. It helps manufacturers streamline their parts supply chain and ensures that vehicles, including the 2021-2026 Audi Q8 and other models, receive the latest components during any necessary service.

Thermostat Part Numbers Involved

The Special Notice SM 58-2025 specifically identifies two thermostat part numbers that dealers are instructed to return. These are:

• 0P2-121-115-C (Thermostat)
• 0P2-121-115-D (Thermostat)

Dealers are advised to re-order required new materials using a successor part number. The new thermostat part number to be used going forward is:

• 0P2-121-115-E (Thermostat)

This change indicates an update or revision to the thermostat component, ensuring that any future installations will use the most current design or specification.

Important Dealer Instructions and Deadlines

Audi has set a clear deadline for dealers to return the superseded thermostat parts. To receive credit and improve inventory levels, dealers must return their stock of material numbers 0P2-121-115-C and 0P2-121-115-D to their facing Parts Distribution Center (PDC) no later than December 2, 2025.

What Owners Should Know

Audi explicitly states that "Items returned after the above-mentioned date WILL NOT be accepted on any type of return/buyback." This strict policy emphasizes the importance for dealers to adhere to the deadline. While this is an internal dealer process, it ultimately affects the availability of correct parts for owners of vehicles such as the Audi Q8.

Dealer Return Procedure Summary

Audi outlines a specific claims procedure for dealers to follow when returning these thermostat parts:

1. Dealers must file a separate "Claim with Return," selecting "Dir Sup. Req. Return" as the item type. They need to complete dealer comments with the Special Notice Number and Parts Circular number.
2. They should review "Parts On Command" the day after for the Delivery List document and contact their PDC if any issues arise.
3. The 40000XXXXX delivery document number must be entered on a YELLOW DEPOT REQUEST RETURN label.
4. This YELLOW DEPOT REQUEST RETURN label must be adhered to the package(s) containing the returned parts.
5. Finally, one copy of the Delivery Document must be included with the returned part(s).

Implications for Audi Owners

This Special Notice SM 58-2025 is an internal inventory management update and not a recall campaign for vehicles currently on the road. Owners of 2021-2026 Audi models, including the Audi Q8, Q7, RS Q8, RS 6 Avant, and RS 7, do not need to take immediate action based on this notice. The primary goal is to ensure that when a thermostat replacement is needed, dealers have the most up-to-date part available.

This proactive approach by Audi helps maintain the quality and reliability of replacement components. If your vehicle requires a thermostat replacement in the future, your Audi service center will automatically use the updated 0P2-121-115-E part, ensuring your vehicle benefits from the latest component revision.

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Source: NHTSA ID: 11026205