NHTSA recall 13V542000

What's wrong: The affected vehicles are equipped with an occupant classification system (ocs) that may not detect a very light person sitting in the front passenger seat.

Why it matters: If the ocs does not detect a very light person sitting in the seat, the passenger side air bag would be turned off. In the event of a crash necessitating side air bag deployment, the passenger would be at an increased risk of injury.

The fix: Mercedes will notify owners, and dealers will replace the passenger side seat cushion including the ocs. The recall began on December 20, 2013.