Saturday, August 8, 2026
RecallGazette

Vehicle problems, recalls & safety intelligence

Mercedes-Benz CL550 2011–2020technical service bulletin

Bulletin ELW-M278Catalyst · NHTSA communication 10237240 · issued May 11, 2023

Technical service bulletin
communication type
Engine and Engine Cooling
component
2011–2020
model years
32
vehicle entries

Official 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: â ¢ A check engine Malfunction Indicator Lamp (â MILâ ) may illuminate due to sulfur contamination in the catalyst.

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.