BRUSSELS—The European Union’s top court ruled on Thursday that Volkswagen breached the law by installing on its cars a so-called defeat device to cheat on emission tests and cannot argue it was merely protecting car engines.
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.