GM's Opel to appear before German diesel emissions panel

The German transport ministry says General Motors' Opel division has been asked to appear before a commission looking into diesel emissions controls after an environmental group claimed two of its models are able to reduce pollution controls. The environmental group, DUH, says it has tested Opel's Zafira and Astra models and claims they reduce pollution controls at some speeds and temperatures. DUH wants them taken off the road. Opel says DUH's tests weren't objective or scientifically grounded, saying "our software was never designed to cheat or deceive." Apparently referring to the computer expert who examined the software for DUH, the company said that "the isolated conclusions of a hacker do not reflect the complex interdependencies of a modern exhaust after-treatment system."