The problem lies within the car’s PRE-SAFE seatbelt pretensioner, where it’s possible that the car may mistakenly detect a correctly engaged seatbelt as being not engaged.
Passengers will be aware of the phenomenon by a warning tone and symbol in the instrument cluster, but the concern is that the pretensioner may not engage to pull the passenger tight against the seat in the event of a crash.
Designed to pull the passenger tight in toward the seat when the car detects the occurrence of a crash, if the PRE-SAFE function does not work, the complete effect of the restraint system is not ensured.
Mercedes-Benz is in the process of alerting affected consumers, and will organise a free repair.
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This issue affects 341 vehicles sold between the period of 1 August 2018 – 31 January 2019, the full list of VIN signatures can be found here.