# Emissions NCU \- 2025040001

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Emissions
- NHTSA id: 11028648
- Published by NHTSA: 2026\-02\-07
- Manufacturer's number: NCU \- 2025040001
- Manufacturer's date: 2026\-02\-07
- NHTSA component: ENGINE; ELECTRICAL SYSTEM

## NHTSA's summary

Mercedes\-Benz AG, the manufacturer of Mercedes\-Benz vehicles, has determined that on certain subject vehicles, the engine control software might not meet current specifications. As a result, the diagnosis routine for monitoring the 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. MBUSA will conduct a voluntary emissions recall. An authorized Mercedes\-Benz dealer will update the engine control unit software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028648-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028648-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine

## Vehicles listed

- 2023 MERCEDES\-BENZ AMG C43
- 2023 MERCEDES\-BENZ AMG C43 4MATIC
- 2023 MERCEDES\-BENZ AMG C63 S E
- 2023 MERCEDES\-BENZ AMG G63
- 2023 MERCEDES\-BENZ AMG SL43
- 2023 MERCEDES\-BENZ AMG SL55
- 2023 MERCEDES\-BENZ AMG SL55 4MATIC\+
- 2023 MERCEDES\-BENZ AMG SL63
- 2023 MERCEDES\-BENZ AMG SL63 4MATIC\+
- 2023 MERCEDES\-BENZ C 300
- 2023 MERCEDES\-BENZ C 300 4MATIC
- 2023 MERCEDES\-BENZ G 550

JSON: [/v1/bulletins/11028648](/v1/bulletins/11028648)

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