Mercedes-Benz USA is recalling certain 2021 S500, S580 and Maybach S580 vehicles. The airbag control unit software might deactivate the occupant recognition control unit, resulting in a deactivated front passenger airbag.

A deactivated passenger airbag increases the risk of injury during a crash, NHTSA says.

Dealers will update the airbag control unit software, free of charge. Owner notification letters are expected to be mailed on Dec. 3, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.