The National Highway Safety Administration is investigating complaints of malfunctions with the front passenger air bag sensors in more than a half-million Subaru Foresters.
In a post on its website Saturday, the NHSA said the investigation centers on Subaru Foresters from the 2016-2018 model years.
The NHSA says its Office of Defects Investigation received 51 complaints about the Foresters' occupant detection system.
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The system is designed to detect when there's someone riding in the front passenger seat and then turn on the air bag so it is ready to deploy in a collision.
The complaints detail instances when the occupant detection systems turned off the front passenger air bag when a person was in the seat.
Subaru of America did not immediately return a call seeking comment.