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2021-2025 Audi Cap Part Return: SM 39-2024 for 4M0-121-321-R

Audi has issued Special Notice SM 39-2024 regarding part number 4M0-121-321-R (Cap) for 2021-2025 Audi A4, A5, Q5, S4, S5 models. Dealers are instructed to return older generation parts by July 22, 2024, to ensure customers receive correct components.

ByAhmet Topcu — Founder & Editor-in-ChiefAutomated summary2025 Audi A5
2025 Audi A5 — manufacturer_communication document image 1
Source: NHTSA manufacturer_communication 11005987
SM 39-20244M0-121-321-RCapAudi parts returngeneration 09SAudi A4 4M0-121-321-RAudi A5 4M0-121-321-RAudi Q5 4M0-121-321-RAudi S4 4M0-121-321-RAudi S5 4M0-121-321-R
Audi A4
2021–2025
Audi A5
2021–2024
Audi Q5
2021–2025
Audi S4
2021–2025
Audi S5
2021–2025

Audi has issued a Special Notice, identified as SM 39-2024, to its parts managers regarding inventory management for a specific component. This notice, dated July 1, 2024, focuses on ensuring that only the most current generation of a particular part is available for customer vehicles. The communication is primarily for dealerships to manage their stock effectively and prevent the installation of outdated parts. Owners searching for information about the Audi 4M0-121-321-R Cap return will find details here.

Affected Part: 4M0-121-321-R (Cap)

This Special Notice SM 39-2024 specifically addresses part number 4M0-121-321-R, which is described as a "Cap". This part is relevant for 2021-2025 Audi A4, A5, Q5, S4, and S5 models. The purpose of this notice is to streamline the inventory of this particular component at Audi dealerships.

Identifying the Correct Part Generation

The notice clarifies that "Parts from generation 09S are good." This means that only parts marked with "09S" or a later generation are considered acceptable for use and should remain in inventory. Conversely, "Parts with prior generation levels must be returned." The document provides visual examples, highlighting that the "09S" marking is typically found directly on the part itself, serving as a key identifier for technicians and parts managers. This ensures that when a replacement is needed, the correct Audi 4M0-121-321-R Cap return process is followed for older stock.

Important Dealer Instructions and Deadlines

Audi has set a strict deadline for the return of these older generation parts. Dealerships must return their inventory of the specified material numbers to their facing Parts Distribution Center (PDC) "no later than 7/22/2024." This deadline is critical for dealers to receive credit for the returned items.

What Owners Should Know

A crucial warning for dealerships, which indirectly impacts owners, states: "Items returned after the above-mentioned date WILL NOT be accepted on any type of return/buyback." This emphasizes the importance of timely action by dealers to avoid financial loss and ensure that only current parts are available in the supply chain. This process helps guarantee that any service requiring the 4M0-121-321-R Cap will use an up-to-date component.

Dealer Return Procedure Summary

To facilitate the return process for the Audi 4M0-121-321-R Cap return, Audi outlines a five-step procedure for dealerships:

  1. File a Claim: Dealers must file a separate "Claim with Return" by selecting "Dlr Sup. Req. Return" under the item type. Dealer comments should reference the Special Notice Number SM 39-2024 and the Parts Circular number.
  2. Review Delivery List: The day after filing the claim, dealers should review "Parts On Command" for the Delivery List document. Any problems or delays should be communicated to their facing PDC.
  3. Apply Return Label: The 40000XXXXX delivery document number must be entered on a "YELLOW DEPOT REQUEST RETURN" label.
  4. Adhere Label: This "YELLOW DEPOT REQUEST RETURN" label must be securely adhered to the package(s) containing the returned parts.
  5. Include Documentation: One copy of the Delivery Document must be included with the returned part(s) inside the package.

Re-ordering New Materials

After returning the older generation parts, dealerships are instructed to "re-order required new materials using the same part number." This ensures that their inventory is replenished with the correct, current generation of the 4M0-121-321-R Cap, ready for future service needs.


Source: NHTSA Manufacturer Communication SM 39-2024

Frequently Asked Questions

What is Audi Special Notice SM 39-2024 about?
Audi Special Notice SM 39-2024 is an internal communication to dealerships regarding the return of older generation parts for the 4M0-121-321-R (Cap). Its purpose is to ensure that only current, approved parts are in dealer inventory and supplied to customers.
Which Audi models are affected by the 4M0-121-321-R Cap notice?
This notice applies to the 2021-2025 Audi A4, A5, Q5, S4, and S5 models. It ensures that any replacement 4M0-121-321-R Cap installed in these vehicles is of the correct generation.
How can I tell if my Audi's 4M0-121-321-R Cap is the correct generation?
The notice states that "Parts from generation 09S are good." and provides visual examples for dealers to identify the correct part. As an owner, you would typically rely on your Audi service center to ensure the correct part is used during any service or repair that involves the Audi 4M0-121-321-R Cap return.
What happens if dealers don't return the old parts by the deadline?
The notice explicitly states: "Items returned after the above-mentioned date WILL NOT be accepted on any type of return/buyback." This means dealers will not receive credit for outdated parts returned after July 22, 2024.
Does this notice mean there's a problem with my current Audi 4M0-121-321-R Cap?
This notice is an inventory management directive for dealerships, not a recall or a direct indication of a defect in parts already installed in vehicles. It ensures that if your vehicle requires a replacement 4M0-121-321-R Cap, the dealership will provide the most current and correct version.

What Audi A5 owners report

Counted from the records in our database across 19 model years.

377
Owner complaints
22
Recalls
4,447
Service bulletins
9
Crashes reported
3
Fires reported
6
Injuries reported

The 2025 model year

9 complaints, the 10th most of 19 model years on file. Owners reported 0 crashes, 0 fires and 0 injuries for this year, which also has 2 recalls on file.

Engine, the system this article covers, accounts for 68 of 377 complaints (18%), including 2 for 2025.

Complaints by model year

Model years with the most complaints for the Audi A5
200911
201050
201139
201236
201338
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201838
201912
202060
20259

Most-reported systems

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Latest recalls for the 2025 model year

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Recent owner reports about engine

The contact owns a 2025 Audi A5. The contact stated that while driving approximately 45-50 MPH, the vehicle suddenly decelerated without warning to approximately 20 MPH.

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Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.

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