Daimler has once again courted attention for diesel emissions, this time from German prosecutors who have launched a probe into allegations that the automaker failed to prevent emissions cheating, Automotive News Europe reports.

Chairman of Daimler board of management Dieter Zetsche was questioned by German transport minister Andreas Scheuer last year following the discovery of illegal software in one of Mercedes-Benz’s models, and could see the automaker fined by the ministry up to 5,000 euros per car for a total of 750,000 cars. Daimler was ordered to recall more than 200,000 cars in its home market.

Investigations by prosecutors in Stuttgart into individual employees at Daimler have been ongoing since two years ago, according to the report. “We have now also initiated proceedings against Daimler as a company,” a prosecution spokesman said, adding that the company may have ‘neglected its supervisory duties’. The United States Environmental Protection Agency and the California Air Resources Board are also conducting investigations into Mercedes-Benz diesels.

The Stuttgart prosecutors were also considering investigations into Porsche and automotive supplier Bosch for potential emissions cheating, Automotive News Europe said. In June, Volkswagen was fined one billion euros for diesel emissions cheating in one of the largest fines imposed by German authorities.