Mercedes-Benz bulletin LI09_41-N-079165_2_en
Mercedes-Benz filed this with NHTSA as a service bulletin dated Aug 3, 2026, received Sep 4, 2026, about the engine. It names 5 model years (2023–2026). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationComplaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more of the following possible fault codes related to the coolant system: P30040B: Component 'Temperature sensor downstream of charge air cooler' has an open circuit or short circuit to positive. P25567B: Sensor 'Coolant level' has a malfunction. The fluid level is too low. Cause The potential causes for this topic are: A. A leak in the Coolant System, other than the Charge Air Cooler. B. An Internal leak of the Charge Air Cooler. C. An unapproved/aftermarket upfit or modification to the coolant system. Remedy A. A leak in the Coolant System, other than the Charge Air Cooler 1. Complete a coolant system pressure test: •Refer to WIS Doc AR20.00‑D‑1011TS ‑ Check engine cooling system for leak tightness. •Use Tester Cap 210 589 00 91 and Pressure Pump 124 589 24 21 00. •Apply test pressure to the engine cooling system. Do not exceed the specified test pressure of 1.5 Bar to prevent damage to the engine cooling system. •Perform a visual check on the top and bottom of the engine compartment and in the vehicle interior. •If coolant loss or pressure loss is present, perform suitable repair measures depending on the vehicle equipment. •If NO signs of coolant loss are found but pressure loss is present, proceed to Step B. B. An Internal leak of the Charge Air Cooler 1. Inspect the Charge Air Cooler for an internal leak: •Remove either the Throttle Valve or Charge Air Temperature Sensor to inspect for coolant loss. See attachments for the failed Charge Air Cooler. •If coolant is found inside the Charge Air Cooler: •Perform a manual compression test to confirm the absence of internal engine failures per WIS Doc AR01.00‑D‑1201TSM ‑ Check compression pressure. •Remove and clean any coolant present in the Charge Air System, Intake System, and Cylinders. •Replace the Charge Air Cooler, the glow plugs, and then conduct an oil and filter change. Refer to AR09.41‑D‑6817TSM ‑ Remove/install charge air cooler. •If coolant is not found inside the Charge Air Cooler, proceed to Step C. C. An unapproved/aftermarket upfit or modification to the coolant system 1. Inspect the Coolant system for any unapproved/aftermarket upfits or modifications: •See the Attachments for examples of non‑approved upfits or modifications. •Note: The OM654 cannot have any a
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI09_41-N-079165_2_en | Service bulletin | Aug 3, 2026 | 11036853 | not yet checked |
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: 2026 Mercedes-Benz Sprinter 2500; 2026 Mercedes-Benz Sprinter 3500.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mercedes-Benz LI09_41-N-079165_2_en 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 LI09_41-N-079165_2_en 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 LI09_41-N-079165_2_en cover?
The manufacturer filed it against 5 model years: 2025 Mercedes-Benz Sprinter, 2024 Mercedes-Benz Sprinter, 2023 Mercedes-Benz Sprinter, 2026 Mercedes-Benz Sprinter 2500, 2026 Mercedes-Benz Sprinter 3500. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.