Audi bulletin SM 39-2024
What it saysThis special notice is to inform dealers to return the parts listed if it meets the criteria provided. NHTSA’s full summary ↓
Audi filed this with NHTSA as a manufacturer communication dated Jul 1, 2024, received Aug 6, 2024, about the engine. It names 46 model years (2016–2025). A manufacturer communication is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis special notice is to inform dealers to return the parts listed if it meets the criteria provided.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SM 39-2024 | Other | Jul 1, 2024 | 11005987 |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 4M0-121-321-R | — | — |
Read by machine from the document NHTSA serves (1 page), read Sep 30, 2026. A part number is shown only where it matches Audi’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themand 6 more on this site: 2022 Audi S5, 2021 Audi S5, 2020 Audi S5, 2019 Audi S5, 2018 Audi S5, 2017 Audi S5.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 46 model years this bulletin names have filed 1,239 complaints with NHTSA since 2015. 206 of them name Engine — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
Upon starting the vehicle while parked on 10/18/2025, dashboard displayed warning: "Turn off engine and check coolant level. See owner's manual." Visual inspection revealed coolant residue on mechanical coolant pump switching valve N649 on cylinder head bank 1, indicating water pump internal seal failure allowing coolant to leak into…
2019 Audi S5 · Engine · filed with NHTSA Dec 5, 2025 · ODI 11703321
The vehicle has 36000 miles on it and the oil cooler has failed. The car is meticulously maintained. This failure compromises the ability for the engine to cool properly. Because of the failure, coolant is then forced into the engine oil potentially destroying the engine. Engine replacements are 10,000 for these types of cars.
2018 Audi A5 · Engine · filed with NHTSA Jul 25, 2025 · ODI 11676163
An Audi dealer has just diagnosed my 2018 S5 Cabriolet Prestige with vacuum system contamination caused by water pump failure. I had requested the diagnostic due to small coolant leaks on the engine and loss of coolant in the expansion tank. No warning lights and no overheating yet. Not yet aware of any loss of performance.
2018 Audi S5 · Engine · filed with NHTSA Dec 14, 2025 · ODI 11704929
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group179 other manufacturer communications filed against these Audi models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Audi list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_2079927_3 | Service bulletin | Sep 30, 2026 | This bulletin provides information when the exhaust emissions warning lamp lights up; DTC P050A; 2.0 ltr 4-cyl. |
| TSB_2083393_1 | Service bulletin | Sep 25, 2026 | This bulletin provides information when the starter/generator drive belt is noisy or came off. |
| TSB_2079911_4 | Service bulletin | Sep 25, 2026 | This bulletin provides information when the MIL is on; DTC P050600 with Symptom 4008 stored in ECM V6 TFSI. |
| TSB_2078914_6 | Service bulletin | Sep 25, 2026 | This bulletin provides information when the MIL is on; DTC P064F00 stored in the ECM. |
| TSB_2069531_2 | Service bulletin | Sep 25, 2026 | This bulletin provides information when the MIL is on, EVAP pressure/temp sensor incorrect DTC displayed: P202400, P045000, P045200, P24D600… |
| TSB_2078849_3 | Service bulletin | Sep 23, 2026 | This bulletin provides information regarding an oil change when replacing the engine control unit. |
| TSB_2083287_1 | Service bulletin | Sep 18, 2026 | This Pending Service Solution (PSS) requests that technicians create a record in the PSS database when DTC P001400 camshaft position is stor… |
| TSB_2081030_4 | Service bulletin | Sep 14, 2026 | This bulletin provides information when there is an abnormal knocking noise from the engine compartment; V6 3.0L TFSI. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Audi, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Audi SM 39-2024 a recall?
No. A manufacturer communication is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the SM 39-2024 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does SM 39-2024 cover?
The manufacturer filed it against 46 model years: 2025 Audi A4, 2024 Audi A4, 2023 Audi A4, 2022 Audi A4, 2021 Audi A4, 2020 Audi A4 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.