BERLIN -- German regulators investigating automakers for emissions have summoned representatives of Fiat Chrysler Automobiles and Opel for a meeting, Transport Minister Alexander Dobrindt said.
Officials from the KBA Federal Motor Transport Authority will meet with the automakers next week, he told reporters on Friday.
The move follows claims by environmental activist group Deutsche Umweltilfe (DUH) that Opel Astra and Zafira 1.6-liter diesel models and the Fiat 500X 2.0-liter diesel variant had NOx emissions far above legal norms.
Opel said its vehicles do not have illegal software to fool official tests. It pointed to tests by the KBA which concluded that only Volkswagen Group has used defeat devices to cheat emissions tests.
"We do not believe that these [DUH] results are objective or scientifically founded," Opel said in a statement.
Fiat declined to comment.
Reuters contributed to this report