Mercedes-Benz bulletin LI82.10-P-078301
What it saysComplaint Headlamp, front fog lamp leaky or fogged. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Apr 16, 2026, received Sep 13, 2024, about the exterior lighting — 5 documents under this number. It names 223 model years across Mercedes-Benz and smart (2016–2026). 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.
One page for every brand it was filed under. Each brand’s bulletins: Mercedes-Benz · smart.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationComplaint Headlamp, front fog lamp leaky or fogged. Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1. Drive vehicle into workshop (temperature higher than +18 °C/+64.4 °F) and connect the exhaust extraction. Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the hood. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing of fogged/condensed LED headlamps and LED rear lamps on electric vehicles: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). 2. Connect battery backup via a charger. 3. Open the front-end flap and ensure sufficient ventilation. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing fogged/condensed halogen/xenon headlamps: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine. 3. Open the hood. 4. Switch off the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Note: If there is no visible reduction in condensation, check the headlamp for malfunctions. (see Remedy 2) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Note: Only implement Remedy 1 for model series 463 (from model year 2018) and model series 465. Remedy 2 A defective headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI82.10-P-078301 | Service bulletin | Apr 16, 2026 | 11031580 | PDF, 39 KB |
| LI82.10-P-078301 | Service bulletin | Mar 9, 2026 | 11029959 | PDF, 38 KB |
| LI82.10-P-078301 | Service bulletin | Feb 24, 2026 | 11029025 | PDF, 38 KB |
| LI82.10-P-078301 | Service bulletin | Apr 28, 2025 | 11017496 | PDF, 38 KB |
| LI82.10-P-078301 | Service bulletin | Sep 10, 2024 | 11007753 | PDF, 38 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 themMercedes-Benz 219 model years
and 120 more on this site: 2025 Mercedes-Benz CLE-Class, 2024 Mercedes-Benz CLE-Class, 2023 Mercedes-Benz CLS-Class, 2022 Mercedes-Benz CLS-Class, 2021 Mercedes-Benz CLS-Class, 2020 Mercedes-Benz CLS-Class, 2019 Mercedes-Benz CLS-Class, 2018 Mercedes-Benz CLS-Class, 2017 Mercedes-Benz CLS-Class, 2016 Mercedes-Benz CLS-Class, 2026 Mercedes-Benz E-Class, 2025 Mercedes-Benz E-Class, 2024 Mercedes-Benz E-Class, 2023 Mercedes-Benz E-Class, 2022 Mercedes-Benz E-Class, 2021 Mercedes-Benz E-Class, 2020 Mercedes-Benz E-Class, 2019 Mercedes-Benz E-Class, 2018 Mercedes-Benz E-Class, 2017 Mercedes-Benz E-Class, 2016 Mercedes-Benz E-Class, 2025 Mercedes-Benz EQB, 2024 Mercedes-Benz EQB, 2023 Mercedes-Benz EQB, 2022 Mercedes-Benz EQB, 2025 Mercedes-Benz EQE, 2024 Mercedes-Benz EQE, 2023 Mercedes-Benz EQE, 2025 Mercedes-Benz EQS, 2024 Mercedes-Benz EQS, 2023 Mercedes-Benz EQS, 2022 Mercedes-Benz EQS, 2025 Mercedes-Benz G-Class, 2024 Mercedes-Benz G-Class, 2023 Mercedes-Benz G-Class, 2022 Mercedes-Benz G-Class, 2021 Mercedes-Benz G-Class, 2020 Mercedes-Benz G-Class, 2019 Mercedes-Benz G-Class, 2018 Mercedes-Benz G-Class, 2017 Mercedes-Benz G-Class, 2016 Mercedes-Benz G-Class, 2016 Mercedes-Benz GL-Class, 2026 Mercedes-Benz GLA-Class, 2025 Mercedes-Benz GLA-Class, 2024 Mercedes-Benz GLA-Class, 2023 Mercedes-Benz GLA-Class, 2022 Mercedes-Benz GLA-Class, 2021 Mercedes-Benz GLA-Class, 2020 Mercedes-Benz GLA-Class, 2019 Mercedes-Benz GLA-Class, 2018 Mercedes-Benz GLA-Class, 2017 Mercedes-Benz GLA-Class, 2016 Mercedes-Benz GLA-Class, 2026 Mercedes-Benz GLB-Class, 2025 Mercedes-Benz GLB-Class, 2024 Mercedes-Benz GLB-Class, 2023 Mercedes-Benz GLB-Class, 2022 Mercedes-Benz GLB-Class, 2021 Mercedes-Benz GLB-Class, 2020 Mercedes-Benz GLB-Class, 2026 Mercedes-Benz GLC-Class, 2025 Mercedes-Benz GLC-Class, 2024 Mercedes-Benz GLC-Class, 2023 Mercedes-Benz GLC-Class, 2022 Mercedes-Benz GLC-Class, 2021 Mercedes-Benz GLC-Class, 2020 Mercedes-Benz GLC-Class, 2019 Mercedes-Benz GLC-Class, 2018 Mercedes-Benz GLC-Class, 2017 Mercedes-Benz GLC-Class, 2016 Mercedes-Benz GLC-Class, 2026 Mercedes-Benz GLE-Class, 2025 Mercedes-Benz GLE-Class, 2024 Mercedes-Benz GLE-Class, 2023 Mercedes-Benz GLE-Class, 2022 Mercedes-Benz GLE-Class, 2021 Mercedes-Benz GLE-Class, 2020 Mercedes-Benz GLE-Class, 2019 Mercedes-Benz GLE-Class, 2018 Mercedes-Benz GLE-Class, 2017 Mercedes-Benz GLE-Class, 2016 Mercedes-Benz GLE-Class, 2026 Mercedes-Benz GLS-Class, 2025 Mercedes-Benz GLS-Class, 2024 Mercedes-Benz GLS-Class, 2023 Mercedes-Benz GLS-Class, 2022 Mercedes-Benz GLS-Class, 2021 Mercedes-Benz GLS-Class, 2020 Mercedes-Benz GLS-Class, 2019 Mercedes-Benz GLS-Class, 2018 Mercedes-Benz GLS-Class, 2017 Mercedes-Benz GLS-Class, 2016 Mercedes-Benz GLS-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, 2020 Mercedes-Benz S-Class, 2019 Mercedes-Benz S-Class, 2018 Mercedes-Benz S-Class, 2017 Mercedes-Benz S-Class, 2016 Mercedes-Benz S-Class, 2026 Mercedes-Benz SL-Class, 2025 Mercedes-Benz SL-Class, 2024 Mercedes-Benz SL-Class, 2023 Mercedes-Benz SL-Class, 2022 Mercedes-Benz SL-Class, 2020 Mercedes-Benz SL-Class, 2019 Mercedes-Benz SL-Class, 2018 Mercedes-Benz SL-Class, 2017 Mercedes-Benz SL-Class, 2016 Mercedes-Benz SL-Class, 2020 Mercedes-Benz SLC-Class, 2019 Mercedes-Benz SLC-Class, 2018 Mercedes-Benz SLC-Class, 2017 Mercedes-Benz SLC-Class, 2016 Mercedes-Benz SLC-Class, 2016 Mercedes-Benz SLK-Class.
Also filed against model years this site has no page for: 2018 Mercedes-Benz A 220; 2020 Mercedes-Benz A000 970 1402; 2020 Mercedes-Benz A000 970 1802; 2020 Mercedes-Benz A000 970 2102; 2020 Mercedes-Benz AMG A45; 2022 Mercedes-Benz AMG C63 S; 2024 Mercedes-Benz AMG C63 S E; 2024 Mercedes-Benz AMG C63 S E 4MATIC+; 2021 Mercedes-Benz AMG E53 S; 2023 Mercedes-Benz AMG E53E; 2022 Mercedes-Benz AMG E63; 2022 Mercedes-Benz AMG E63S; 2017 Mercedes-Benz AMG GT C Roadster; 2020 Mercedes-Benz AMG GT S; 2020 Mercedes-Benz AMG GT43; 2024 Mercedes-Benz AMG GT53E; 2022 Mercedes-Benz AMG GT63; 2022 Mercedes-Benz AMG GT63 S; 2024 Mercedes-Benz AMG GT63 S E; 2024 Mercedes-Benz AMG GT63 S E Performance; 2026 Mercedes-Benz AMG GT63 S E Performance 4MATIC+; 2018 Mercedes-Benz AMG GTA; 2023 Mercedes-Benz AMG S 63 E 4MATIC+; 2024 Mercedes-Benz AMG S 63 E 4MATIC+; 2022 Mercedes-Benz AMG SL43; 2024 Mercedes-Benz AMG SL53E; 2024 Mercedes-Benz AMG SL63 S E; 2019 Mercedes-Benz AMG SL65; 2018 Mercedes-Benz B 160; 2019 Mercedes-Benz B 180; 2019 Mercedes-Benz B 200; 2019 Mercedes-Benz B 220; 2018 Mercedes-Benz B 250E; 2016 Mercedes-Benz B160; 2017 Mercedes-Benz B160; 2023 Mercedes-Benz CLE 300; 2023 Mercedes-Benz CLE 450; 2016 Mercedes-Benz CLE 63S; 2018 Mercedes-Benz E 400 4MATIC Cabriolet; 2018 Mercedes-Benz E 400 4MATIC Wagon; 2019 Mercedes-Benz E 450 4MATIC Cabriolet; 2020 Mercedes-Benz E 450 4MATIC Cabriolet; 2019 Mercedes-Benz E 450 4MATIC Wagon; 2020 Mercedes-Benz E 450 4MATIC Wagon; 2026 Mercedes-Benz E 53 4MATIC+; 2026 Mercedes-Benz E53 E 4MATIC+ ALL-Terrain; 2020 Mercedes-Benz EQC 400; 2021 Mercedes-Benz EQC 400 E; 2017 Mercedes-Benz GL350; 2017 Mercedes-Benz GL450; 2017 Mercedes-Benz GL550; 2024 Mercedes-Benz Redundant EQE 350; 2023 Mercedes-Benz Redundant EQE 350 4MATIC; 2023 Mercedes-Benz Redundant EQS 450; 2024 Mercedes-Benz Redundant EQS 450; 2018 Mercedes-Benz S 550; 2019 Mercedes-Benz S 550; 2020 Mercedes-Benz S 550; 2017 Mercedes-Benz SLK 350.
smart 4 model years
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 164 model years this bulletin names have filed 4,587 complaints with NHTSA since 2015. 52 of them name Exterior Lighting — 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.
Despite maintaining the vehicle according to the recommended schedule, I have encountered ongoing performance issues (electrical, rear shocks, fan motor etc.) that are not in line with the standard of quality I expect from a brand of your reputation. Window not going down all the way on the driver side. Radio not working but was fixed.
2022 Mercedes-Benz GLB-Class · Exterior Lighting · filed with NHTSA Jun 24, 2025 · ODI 11668913
2021 Mercedes GLC 43 headlight is inoperable. Same as reported in campaign 22V261000: "Headlight failure can decrease visibility for both the driver and surrounding traffic, increasing the risk of a crash." Although our car was produced before the dates reported in campaign 22V261000, I believe this is the same defect and the recall…
2021 Mercedes-Benz GLC-Class · Exterior Lighting · filed with NHTSA Sep 26, 2025 · ODI 11689974
Unable to read onboard computer screen in daylight conditions. The dimmer switch does not change the light setting on the computer screen, but does change the lighting illumination on the tach and speedometer. The computer screen has come on bright a few times in the past year, but only for less than a minute.
2019 Mercedes-Benz AMG GT · Exterior Lighting · filed with NHTSA Feb 3, 2022 · ODI 11450273
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 exterior lighting
Source: same model, same component group18 other manufacturer communications filed against these Mercedes-Benz models under the same component group (exterior lighting), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI82.10-P-080467 | Service bulletin | May 13, 2026 | Complaint Despite the IC message shown in these complaints, the primary low-beam function is not restricted. Complaint No. 1: Sporadic "Head… |
| LI82.20-P-080425 | Service bulletin | Apr 8, 2026 | Complaint Optical irregularity in the light guide of the ambient lighting. Cause Exposure to external factors, e.g. cleaning or disinfecting… |
| PSL- NCU Return Parts 4/3 | Other | Apr 3, 2026 | The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The de… |
| LI82.10-P-078307 | Service bulletin | Feb 25, 2026 | Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can occur under certain climatic condi… |
| LI82.10-P-078896 | Service bulletin | Feb 24, 2026 | Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can occur under certain climatic condi… |
| LI82.10-P-079179 | Service bulletin | Sep 3, 2025 | Complaint Message in instrument cluster "Adaptive high beams assistant not available/inoperative" or "DIGITAL LIGHT reduced range of functio… |
| LI88.20-P-079404 | Service bulletin | Jul 31, 2025 | Complaint "Standing Lights Inoperative" instrument cluster message. Cause Radiator shell illuminated with LED modules partially… |
| LI82.20-P-079313 | Service bulletin | May 22, 2025 | Complaint The adaptive rear compartment lighting is sporadically inoperative. In one or all rear interior lamps, one of the following specif… |
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 and smart, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mercedes-Benz LI82.10-P-078301 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 LI82.10-P-078301 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 LI82.10-P-078301 cover?
The manufacturer filed it against 223 model years across 2 brands (Mercedes-Benz and smart): 2022 Mercedes-Benz A-Class, 2021 Mercedes-Benz A-Class, 2020 Mercedes-Benz A-Class, 2019 Mercedes-Benz A-Class, 2026 Mercedes-Benz AMG GT, 2025 Mercedes-Benz AMG GT and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.