The scandal known as "Dieselgate" erupted five years ago when the U.S. Environmental Protection Agency found that Volkswagen had installed special software to rig U.S. emissions tests for its latest "clean diesel" vehicles.
Volkswagen was referred to as "company X" in the court ruling, which established that "a manufacturer cannot install a defeat device which systematically improves, during approval procedures, the performance of the vehicle emission control system and thus obtain approval of the vehicle." In its detailed and technical ruling, the court dismissed the idea that the presence of the device could be justified by the fact it contributes to preventing the ageing or clogging up of the engine.