Electrical system

Bulletin number

NCU - 2023070022

Component

Electrical system

Summary

Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that the software for the engine control unit in the subject vehicles may not meet current specifications. As a result, the diagnosis for monitoring the air fuel ratio might not be activated in low load operation as intended. In addition, catalytic converter aging might not be immediately detected and so, may not illuminate a check engine Malfunction Indicator Lamp (“MIL”). After a cold start in the "catalytic converter heating" operating mode, misfires might occur and the check engine MIL would be illuminated. Consequently, these issues may not meet local legal requirements for on-board diagnostics and/or exhaust gas emissions. MBUSA will conduct a voluntary Emissions Recall Campaign in which an authorized Mercedes-Benz dealer will update the software in the affected vehicles.

Owners of these vehicles have filed 1 complaints in the electrical category.