The Japanese government is investigating other marine engine makers in the country after the disclosure that Hitachi Zosen and two of its subsidiaries have falsified emissions testbed data of over 1,300 engines.

The Maritime Bureau of the country’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT), said it will also not issue any related certificates to Hitachi or other engine makers until they are fully compliant with regulations

Hitachi Zosen, and its subsidiaries Hitachi Zosen Marine Engines Corp and IMEX, make engines under license for MAN Energy Solutions and WinGD, two of the shipping industry’s largest engine makers.