# Emissions Emissions \- 2026010005

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: 11030652
- Published by NHTSA: 2026\-04\-03
- Manufacturer's number: Emissions \- 2026010005
- Manufacturer's date: 2026\-04\-02
- NHTSA component: ELECTRICAL SYSTEM; ENGINE

## NHTSA's 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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030652-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030652-9999.pdf)

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

## Components

Electrical system, Engine

## Vehicles listed

- 2021 to 2023 MERCEDES\-BENZ AMG CLA35
- 2021 to 2023 MERCEDES\-BENZ AMG CLA45
- 2021 to 2023 MERCEDES\-BENZ AMG GLA35
- 2021 to 2023 MERCEDES\-BENZ AMG GLA45
- 2021 to 2023 MERCEDES\-BENZ CLA 250
- 2021 MERCEDES\-BENZ CLA 250 4MATIC
- 2021 to 2023 MERCEDES\-BENZ GLA 250
- 2021 MERCEDES\-BENZ GLA 250 4MATIC

JSON: [/v1/bulletins/11030652](/v1/bulletins/11030652)

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