emissions by retrofitting diesel engines usually with a software update so far the industry isn t saying how many cars still need retrofitting diesel drivers are also in the dark about what comes next. yasmina for me my family is already thinking about buying a new car. and i don t really worried in fact i m outraged at the new cars that they re making at least they ought to be clean. it s been three years since the diesel emissions cheating scandal broke despite this new diesel cars are still being sold whose emissions far exceed the european limits on nitrogen oxides the chemicals that cause smog test show folks flagons diesel models put out nearly twice as much nitrogen oxide as is permitted b m w s diesels emit three times the limit and opel models exceed those pollution limits on average by