Mercedes-Benz bulletin LI49.20-N-075995
What it saysVehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint SCR or AdBlue warning message cannot be reset. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Mar 23, 2026, received Apr 5, 2023, about the engine — 4 documents under this number: LI49-20-N-075995 and 3 more. It names 7 model years (2019–2025). 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 communicationVehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint SCR or AdBlue warning message cannot be reset. All fault codes in the AdBlue (SCR) control unit have been processed and corrected, however fault codes P13DF00 or P300685 remain active and stored. Cause The procedure for resetting the SCR or AdBlue warning message with XENTRY Diagnosis has not been carried out. Note: If AdBlue quality or concentration related fault codes are present, such as P300494, P203B31, or P206B31, complete the applicable diagnostic procedure first. This includes the thaw, mixing drive, and retest requirements in LI49.20-N-080376 and the detailed diagnosis and re-pair steps in LI49.20-N-078838 as applicable. Do not attempt to reset the SCR or AdBlue warning message until the underlying fault condition has been corrected. Remedy Note: Do not replace any parts for an incorrectly executed reset procedure. 1. Connect the battery charger •Maintain adequate voltage throughout the procedure per applicable guidance. 2. Connect the diagnostic device •Use the latest version of XENTRY Diagnosis and Add-Ons. 3. Reset the SCR or AdBlue warning message using XENTRY Diagnosis •Quick test view → N118/5 – Selective Catalytic Reduction (SCR GEN4) → Special processes → Reset SCR/AdBlue® warning message. Note: Ensure all 5 listed processes are completed successfully, indicated by Actual value: "successfully completed". 4. Complete the disconnect and sleep mode initiation procedure •Disconnect XENTRY. •Refer to manual AD00.00-D-2000-06TS for the correct procedure to disconnect the diagnostic device from Model 907. •Disconnect the Battery Charger •Refer to manual AR54.10-D-1127TS for instructions on safely disconnecting the battery charger from Model 907. •Turn off the ignition. •Remove the key. •Lock the vehicle and wait approximately 15 minutes to allow the CAN bus system to enter sleep mode. 5. Post sleep mode vehicle start •After the 15-minute waiting period, start the vehicle. Note: The "starts remaining" message will remain on the Instrument Cluster (IC), but the vehicle will not be in the 5mph de-rate mode. 6. Drive for system self-test •Drive the vehicle for 5 to 10 miles to enable the SCR system to perform a self-test. Note: During the warning reset process, ensure the outside temperature sensor is reading above 10 degr
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI49-20-N-075995 | Service bulletin | Mar 23, 2026 | 11030626 | PDF, 42 KB |
| LI49.20-N-075995 | Service bulletin | Jan 15, 2026 | 11028119 | PDF, 43 KB |
| LI49.20-N-075995 | Service bulletin | Mar 6, 2025 | 11016428 | PDF, 42 KB |
| LI49.20-N-075995 | Service bulletin | Mar 8, 2023 | 10233787 | PDF, 41 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 themA 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 7 model years this bulletin names have filed 389 complaints with NHTSA since 2015. 57 of them name Engine, Fuel/Propulsion System — 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.
on 08-03=23, I as driving MB sprinter van on highway Route 84 east toward Connecticut, when I was near Southington exit smoke was coming out of AC vent, I took exit to route 10 and stopped van right after exit on the road, and opened hood, there was active fire near lower left side engine, with help of drivers who stopped behind me, I…
2020 Mercedes-Benz Sprinter · Engine · filed with NHTSA Aug 22, 2023 · ODI 11539986
The ECM harness was wired too close to a sharp metal piece within the engine bay, the clip MBZ uses to secure it was insufficient to hold it back, the thick wiring harness got caught on the metal piece and overtime got cut deeply causing a short with thermal issues spreading to other components, the wiring harness melted together and…
2023 Mercedes-Benz Sprinter · Engine · filed with NHTSA Oct 8, 2026 · ODI 11769942
Complaint Description I am filing this complaint with the National Highway Traffic Safety Administration regarding a safety issue with my new Mercedes Benz Sprinter 2500. I purchased this vehicle brand new from Mercedes Benz Manhattan. From the first day of ownership, I began experiencing multiple serious problems with the van.
2024 Mercedes-Benz Sprinter · Engine · filed with NHTSA Mar 15, 2026 · ODI 11724480
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 group32 other manufacturer communications filed against the Mercedes-Benz Sprinter under the same component group (engine), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI20_10-N-080868_2_en | Service bulletin | Sep 2, 2026 | Coolant warning light (MIL) lights up on the display Complaint The coolant warning lamp may be displayed in the instrument cluster. The malf… |
| LI09_41-N-079165_2_en | Service bulletin | Aug 3, 2026 | Complaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more o… |
| LI07.16-N-080731 | Service bulletin | Jun 18, 2026 | Complaint The customer reports an exhaust odor from the engine compartment, potentially accompanied by a check engine light and/or engine mi… |
| LI14.20-N-073867 | Service bulletin | Jun 15, 2026 | Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for… |
| LI09.41-N-080666 | Service bulletin | Jun 3, 2026 | Check engine light with reduced power –P300A6D due to charge air system contamination Complaint The check engine light is activated, accompa… |
| LI05.30-N-080518 | Service bulletin | Jun 3, 2026 | OM654 Extended engine crank or starting concerns and/or poor running characteristics Complaint One or more of the following may be reported:… |
| LI4910-N-060969 | Service bulletin | Apr 18, 2026 | Complaint Rattling noise from underneath the vehicle. Cause One or more of the following conditions may be present: 1. The exhaust bracket f… |
| LI4920N078838 | Service bulletin | Feb 24, 2026 | Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint T… |
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 LI49.20-N-075995 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 LI49.20-N-075995 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 LI49.20-N-075995 cover?
The manufacturer filed it against 7 model years: 2025 Mercedes-Benz Sprinter, 2024 Mercedes-Benz Sprinter, 2023 Mercedes-Benz Sprinter, 2022 Mercedes-Benz Sprinter, 2021 Mercedes-Benz Sprinter, 2020 Mercedes-Benz Sprinter and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.