Engine

Bulletin number

Emissions - 2026010005

Component

Engine

Summary

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles equipped with M139 gasoline engine, the nozzle geometry of the exhaust turbocharger might not meet specifications. This could affect exhaust flow in certain load/rpm ranges and increase NOx emissions, potentially causing the vehicle to exceed emissions regulatory limits. MBUSA will conduct an emission service campaign. An authorized Mercedes-Benz dealer will update the engine control unit software on the affected vehicle.

Owners of these vehicles have filed 16 complaints in the engine category.