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Service bulletin ELW-M278Catalyst

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10237240
Published by NHTSA2023-06-05
Manufacturer's numberELW-M278Catalyst
Manufacturer's date2023-05-11
NHTSA componentENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR

NHTSA's summary

This extended warranty applies to the following condition that may necessitate the repair or replacement of the catalytic converter system and is related to: • A check engine Malfunction Indicator Lamp (‘MIL’) may illuminate due to sulfur contamination in the catalyst.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Exhaust and emissions, Catalytic converter

Vehicles listed
MERCEDES-BENZ CL5502011 to 2014
MERCEDES-BENZ CLS 5502016
MERCEDES-BENZ CLS 5502018
MERCEDES-BENZ CLS5502011 to 2015
MERCEDES-BENZ CLS5502017
MERCEDES-BENZ E5502012 to 2017
MERCEDES-BENZ S5502012 to 2017
MERCEDES-BENZ SL 5502018 to 2020
MERCEDES-BENZ SL5502013 to 2017

Listing a model year does not mean every vehicle of it is concerned: the document says which.