Mercedes-Benz bulletin LI49.20-N-079157_6
What it saysComplaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: P20F409: The Adblue consumption is too low. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jun 24, 2025, received Jul 1, 2025, about the electrical system. It names 6 model years (2019–2024). 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause The potential causes for these fault codes are: A. A leak in the Adblue System B. An internal fault with the Adblue Injection Valve #1 (Motor side) C. An air pocket forming in the Adblue Injection Valve #1 (Motor side) Adblue Injector Line Remedy Vehicles Produced Before August 1, 2024 (Code XY4 = MY24) A. Leak in the AdBlue System 1. Complete the Guided Tests for DTC P20F409 or P202E84: •Inspect the AdBlue tank, pump, line, and both injectors for leaks. •Ensure the AdBlue line is properly routed, securely fastened, and not in contact with the exhaust system. •Remove both AdBlue injection valves, perform 2–3 pressure build-ups, and check for AdBlue leaks. •If a leak is detected, repair it and retest. B. Internal Fault with AdBlue Injection Valve #1 (Motor Side) 1. Process All Other Related DTCs First: •Address any other fault codes relating to AdBlue injection valves before proceeding. •If AdBlue Injection Valve #1 (engine side) fails the guided tests, replace it and retest. C. Air Pocket Forming in the AdBlue Line (Motor Side) 1. If Guided Tests Pass and No Leaks are Found: --Do not replace any components.-- •The MY23-24 (Code XY4 = MY24, OM654) AdBlue line (A907 470 01 01) has a known design issue that can cause air pockets and DTC P20F409. This may also result in DTC P202E84, depending on the air pocket size. •The guided tests for P20F409 now include resetting the learned values for the AdBlue delivery pump (A103m1). After this, the vehicle can be released to the customer. NOTE: Replacing the AdBlue tank or line will NOT resolve this air pocket issue. TIPS cases are no longer required for MY23–24 vehicles. Steps to Perform (MY23–24, Code XY4): 1. Complete the guided tests for DTC P20F409 and/or P202E84. 2. Perform an initial start-up of: •The SCR control unit •AdBlue tank components •Both AdBlue injectors 3. Conduct a 20-mile test drive. If no faults occur, the vehicle can be released. 4. Inform the customer that frequent starting/stopping increases the likelihood of this fault due to repeated cycling of AdBlue in/ou
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI49.20-N-079157_6 | Service bulletin | Jun 24, 2025 | 11019973 | PDF, 42 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A907 470 33 02 | is present | — | eBay Motors → |
| A907 470 01 01 | TIPS Case Instructions for All MY25 and Newer Vehicles | — | eBay Motors → |
Read by machine from the document NHTSA serves (4 pages), read Sep 30, 2026. A part number is shown only where it matches Mercedes-Benz’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 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 6 model years this bulletin names have filed 385 complaints with NHTSA since 2015. 74 of them name Electrical 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.
The contact owns a 2020 Mercedes-Benz Sprinter 3500. The contact received notification of NHTSA Campaign Number: 22V360000 (Electrical System, Communication) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
2020 Mercedes-Benz Sprinter · Electrical System · filed with NHTSA Sep 9, 2022 · ODI 11483702
Charging issue with house battery side of class B camping van. It became somewhat apparent the system was not charging properly and quickly escalated to a high overcharge situation, followed by evidence of electrical short in smells and possible smoke in engine bay. The car was in for service for a month and a half.
2022 Mercedes-Benz Sprinter · Electrical System · filed with NHTSA Jan 30, 2025 · ODI 11639645
The active distance assist inoperative appears when using the cruise control. This comes on when no traffic in front of the vehicle for 1 hour or less. Also Active Brake Assist functions limited - see operators Manual To reset: follow another vehicle for 5 minutes. This is Very Very Very frustrating and UNSAFE.
2019 Mercedes-Benz Sprinter · Electrical System · filed with NHTSA Nov 10, 2024 · ODI 11624407
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 electrical system
Source: same model, same component group3 other manufacturer communications filed against the Mercedes-Benz Sprinter under the same component group (electrical system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 2025080008 | Service campaign | Sep 4, 2025 | MBAG has determined the software of the control unit for the anti-theft warning system does not correspond to the current production configu… |
| LI47.70-N-079422_1 | Service bulletin | Jun 12, 2025 | HV battery is not charging to its full capacity with restricted maximum SoC Complaint The vehicle's HV battery is not charging to its full c… |
| LI88.30-N-078036 | Service bulletin | Jul 14, 2024 | Complaint T57 Electric step inoperative with warning on cluster. Cause Possible damage to end position sensors. |
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-079157_6 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-079157_6 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-079157_6 cover?
The manufacturer filed it against 6 model years: 2024 Mercedes-Benz Sprinter, 2023 Mercedes-Benz Sprinter, 2022 Mercedes-Benz Sprinter, 2021 Mercedes-Benz Sprinter, 2020 Mercedes-Benz Sprinter, 2019 Mercedes-Benz Sprinter. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built before 1 Aug 2024; built after 1 Aug 2024 — the build date is on the certification label in the driver’s door jamb.