Mercedes-Benz bulletin LI91.16-P-073576
What it saysComplaint Driver's seat and/or front passenger seat cannot be adjusted. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated May 20, 2026, received May 21, 2026, about the seats. It names 8 model years (2021–2026). A service bulletin 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 communicationComplaint • Driver's seat and/or front passenger seat cannot be adjusted. • Not possible to adjust front seats to memory preset. • Head restraints of front seats cannot be adjusted. • Cannot move to chauffeur mode/reclining seat position. Fault identification: → Create log of seat control unit (both conditions must be met) 1. Fault B1F7E54 "Head restraint inclination adjustment not normalized. No calibration." stored in fault memory. 2. Value "0C" present in seat control unit log service 0X220239 (see attachment "seat control unit log"). If fault B1FBB15 "Malfunction in 'Head restraint inclination' switch. There is a short circuit to positive or an open circuit." is also stored in the fault memory, the cause might also be due to the wiring or terminal contacts. Cause Faulty head restraints Remedy Replace the affected head restraint
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI91.16-P-073576 | Service bulletin | May 20, 2026 | 11032885 | PDF, 361 KB |
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 themAlso filed against model years this site has no page for: 2024 Mercedes-Benz AMG S 63 E 4MATIC+; 2026 Mercedes-Benz AMG S 63 E 4MATIC+.
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 6 model years this bulletin names have filed 100 complaints with NHTSA since 2015.
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 seats
Source: same model, same component group3 other manufacturer communications filed against these Mercedes-Benz models under the same component group (seats), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI91.29-P-080554 | Service bulletin | May 15, 2026 | Complaint One or more seat functions are restricted or inoperative. This may include: • Seat memory • Automatic seat adjustment • Easy Entry… |
| LI91.16-P-078472 | Service bulletin | Oct 22, 2024 | Complaint When driving on rough ground, there may be noises from the 4-way head restraint of the front seats. The fault profile is not prese… |
| LI91.18-P-077075 | Service bulletin | Dec 4, 2023 | Crease formation on genuine leather seat covers in vehicles with low mileage ⢠Objects left on the seats for extended periods of time… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mercedes-Benz, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mercedes-Benz LI91.16-P-073576 a recall?
No. A service bulletin 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 LI91.16-P-073576 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. Every Mercedes-Benz warranty extension on file lists the ones Mercedes-Benz has filed.
Which vehicles does LI91.16-P-073576 cover?
The manufacturer filed it against 8 model years: 2026 Mercedes-Benz S-Class, 2025 Mercedes-Benz S-Class, 2024 Mercedes-Benz S-Class, 2023 Mercedes-Benz S-Class, 2022 Mercedes-Benz S-Class, 2021 Mercedes-Benz S-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.