Officials from Japan's transport ministry have started an on-site investigation at the Tokyo headquarters of Subaru in connection with the automaker's quality control scandal.
The probe comes after Subaru admitted that unqualified workers conducted pre-shipment vehicle inspections. The checks are mandated by the government to ensure safety.
The company said it has found about 900 cases of data falsification related to fuel efficiency and exhaust emissions.
Ministry officials will question Subaru executives and check documentation to delve into the cause of the scandal.