Who makes the diesel ‘worst offenders’ list?

The diesel emissions testing debacle shows little sign of dying out. After Volkswagen's troubles came to light investigations opened up around the world, with probes into other brands and a host of models. In the US, FCA is forced to confront a civil lawsuit from the Environmental and Natural Resources Division of the Department of Justice. In Europe, Renault's headquarters have been raided and the company faces a possible criminal investigation. Other brands are tackling similar challenges.