# Service bulletin ELW \- M278 Cat

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: Service bulletin
- NHTSA id: 10240203
- Published by NHTSA: 2023\-08\-02
- Manufacturer's number: ELW \- M278 Cat
- Manufacturer's date: 2023\-07\-27
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING

## NHTSA's summary

This NCU replaces the prior NCU issued on May 11, 2023, and clarifies replacement part information. In our continuing efforts to assure the proper performance of Mercedes\-Benz products and to enhance the satisfaction of our customers, Mercedes\-Benz AG \(“MBAG”\), the manufacturer of Mercedes\-Benz vehicles, is extending the warranty coverage on the catalytic converter system in certain Model Year \(“MY”\) vehicles fitted with the M278 8\-cylinder engine listed below: \- MY2011: Original New Vehicle Limited Warranty of 4 years / 50,000 miles New Vehicle to 13 years / 156,000 miles \(whichever occurs first\) \- MY2012: Original New Vehicle Limited Warranty of 4 years / 50,000 miles New Vehicle to 12 years / 144,000 miles \(whichever occurs first\) \- MY2013: Original New Vehicle Limited Warranty of 4 years / 50,000 miles New Vehicle to 11 years / 132,000 miles \(whichever occurs first\) \- MY2014 – MY2020: Original New Vehicle Limited Warranty of 4 years / 50,000 miles New Vehicle to 10 years / 120,000 miles \(whichever occurs first\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10240203-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10240203-9999.pdf)

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

## Components

Engine, Exhaust and emissions

## Vehicles listed

- 2011 to 2014 MERCEDES\-BENZ CL550
- 2016 MERCEDES\-BENZ CLS 550
- 2018 MERCEDES\-BENZ CLS 550
- 2012 to 2015 MERCEDES\-BENZ CLS550
- 2017 MERCEDES\-BENZ CLS550
- 2012 to 2017 MERCEDES\-BENZ E550
- 2012 to 2017 MERCEDES\-BENZ S550
- 2016 to 2017 MERCEDES\-BENZ S550 4MATIC
- 2018 to 2020 MERCEDES\-BENZ SL 550
- 2013 to 2017 MERCEDES\-BENZ SL550
- 2017 MERCEDES\-MAYBACH S550

JSON: [/v1/bulletins/10240203](/v1/bulletins/10240203)

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