Mercedes-Benz AMG C43 2023 — technical service bulletin

Bulletin CL - 2025040001 · NHTSA communication 11029134 · issued Feb 20, 2026

Technical service bulletin

communication type

Electrical System

component

2023

model years

vehicle entries

Official 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 a

Vehicles covered

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.