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RecallGazette

Vehicle problems, recalls & safety intelligence

Mercedes-Benz AMG CLA35 2020–2022 — service campaign

Bulletin NCU - 2026020005 · NHTSA communication 11029057 · issued Feb 28, 2026

Service campaign
communication type
Electrical System
component
2020–2022
model years
27
vehicle entries

Official summary

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the control unit software for the engine electronics does not correspond to the current series production configuration. This may cause the electrical fault diagnosis of the lambda sensor to not operate as intended, so that in the event of a fault, the check engine indicator lamp may not illuminate. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the software for the engine electronics control unit on the affected vehicles.

Vehicles covered

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.