NHTSA ID Number: 11029134
Manufacturer Communication Number: CL - 2025040001
TSB/Document Date: 2026-03-02
Summary
Mercedes-Benz
AG, the manufacturer of Mercedes-Benz vehicles, has decided that on certain model year 2023 C-Class, G-Class and SL vehicles, the engine control unit software may not meet current specifications. Our records indicate that your vehicle is included in the affected population. What is the issue? The diagnosis routine for monitoring the engine’s air-fuel ratio might not be activated as intended and a malfunction in the oxygen sensor could be erroneously detected causing the check engine Malfunction Indicator Lamp (‘MIL’) to illuminate. What will your Mercedes-Benz Dealership do? An authorized Mercedes-Benz dealer will update the engine control unit software. This vehicle repair will be provided at no cost to you. While the repair time can be less than one hour, your dealer can provide you with a better estimate of the overall time for this visit. As a matter of normal service process, the authorized Mercedes-Benz dealer will also check for other repair measures that might be applicable to your vehicle, which may increase the required working time. You will not be charged for other services or repairs unless so requested. Steps to take. • If you have not already had your vehicle repaired for this recall, find your nearest authorized Mercedes-Benz dealer at www.mbusa.com/recall to schedule your recall repair. • Please mention you are scheduling an appointment for Mercedes-Benz recall 2025040001 (CA DMV # 250401). • You may be asked for your VIN, which for your convenience is located at the top of this letter.
IMPORTANT EMISSIONS RECALL
Mercedes-Benz USA, LLC
A Mercedes-Benz Group AG Company
One Mercedes-Benz Drive
Sandy Springs, GA 30328
Phone: (800) 367-6372
This notice applies to your vehicle, VIN: WDBRFXXXXXNNNNMMM
Update Engine Control Unit Software
MBUSA ID: 2025040001, CA DMV # 250401
WDBRFXXXXXNNNNMMM
Customer Name
13470 International Parkway
Jacksonville, FL 32218
• Remedy is now available for your vehicle.
• Schedule an appointment with your authorized
Mercedes-Benz dealership as soon as possible.
• This repair will be provided FREE of charge.
February, 2026
Dear Mercedes-Benz Owner:
Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has decided that on certain model year 2023 C-Class,
G-Class and SL vehicles, the engine control unit software may not meet current specifications. Our records indicate that
your vehicle is included in the affected population.
What is the issue?
The diagnosis routine for monitoring the engine’s air-fuel ratio might not be activated as intended and a
malfunction in the oxygen sensor could be erroneously detected causing the check engine Malfunction
Indicator Lamp (‘MIL’) to illuminate.
.
What will your Mercedes-Benz Dealership do?
An authorized Mercedes-Benz dealer will update the engine control unit software. This vehicle repair will
be provided at no cost to you. While the repair time can be less than one hour, your dealer can provide you
with a better estimate of the overall time for this visit. As a matter of normal service process, the
authorized Mercedes-Benz dealer will also check for other repair measures that might be applicable to
your vehicle, which may increase the required working time. You will not be charged for other services or
repairs unless so requested.
Steps to take.
• If you have not already had your vehicle repaired for this recall, find your nearest authorized MercedesBenz dealer at www.mbusa.com/recall to schedule your recall repair.
• Please mention you are scheduling an appointment for Mercedes-Benz recall 2025040001 (CA DMV #
250401).
• You may be asked for your VIN, which for your convenience is located at the top of this letter.
FOR CALIFORNIA ONLY: A Proof of Correction certificate shall be issued to you by the dealer (California only) showing that
the vehicle has been repaired under this Recall Campaign. The certificate may be required by the Department of Motor
Vehicles as a condition of vehicle registration or operation.
We apologize for any inconvenience this may have caused and look forward to taking care of this important emissions
recall.
Sincerely,
Mercedes-Benz USA
Don’t wait. Find an authorized Mercedes-Benz dealership near you
at mbusa.com/recall and schedule the recall repair right away.
IMPORTANT EMISSIONS RECALL
Mercedes-Benz USA, LLC
A Mercedes-Benz Group AG Company
One Mercedes-Benz Drive
Sandy Springs, GA 30328
Phone: (800) 367-6372
What if I no longer own or drive the vehicle?
In the event you no longer own or drive this vehicle, please visit mbusa.com/recalls to update your
information by submitting your VIN using our VIN recall lookup tool, and completing the “No longer
Own” section on the website. If possible, please provide any contact information of the current
owner/driver so we can contact them.
Additional Information for Owners:
A VIN-based recall lookup tool is available at mbusa.com/recall, which can be used to check whether a vehicle has been
subject to a recall, or had the remedy performed. Should you have any questions or encounter any difficulty regarding this
Recall Campaign, please contact an authorized Mercedes-Benz dealership.
Should an authorized Mercedes-Benz dealership be unable to address your concerns please contact us at 1-(800) FORMERCEDES (1-800-367-6372). We are always happy to hear from you.
Don’t wait. Find an authorized Mercedes-Benz dealership near you
at mbusa.com/recall and schedule the recall repair right away.
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TSB/Document ID: CL - 2025040001
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-20
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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