If the NECK-PRO head restraints were triggered during an accident, you have to reset the head restraints for the driver and front passenger seats. Otherwise, this additional protection will not be available during a later rear end collision. Triggered head restraints can be recognized by the fact that they are moved forward and can no longer be adjusted.
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Airbags: Limited protection from airbags
WARNING Risk of injury due to modifications to the airbag cover If you modify the cover of an airbag or affix objects such as stickers to it, the airbag may no longer function correctly. Never modify the cover of an airbag and do not affix objects to it. The installation location of an airbag is id ...