The Department of Transportation raided the headquarters of Subaru Corp. on Wednesday after the automaker submitted a report saying it had rigged mileage and emissions data for new vehicles at one of its plants.

The ministry will question senior company officials about the report and determine what action to take.

The company changed the fuel economy and other data during the final inspection process for new cars at the plant in Ota, Gunma Prefecture.

The report released April 27 said the data falsification was carried out systematically on the orders of the chief of inspection staff, but that senior staff were unaware of the misconduct.

Subaru said the malpractice, which began as early as 2002, affected 903 units across all of its nine models, including the Forester sport utility vehicle, as well as Toyota’s 86 sports car, made by Subaru.

The revelation was yet another black mark against the automaker, which admitted late last year that unauthorized personnel carried out inspections of new cars, triggering a massive nationwide recall.