Volkswagen engineers have told investigators that certain petrol engines in VW, Audi and Porsche vehicles can be used to manipulate emissions tests, Sunday paper Bild am Sonntag said. A spokesman for Volkswagen - the parent company of Audi and Porsche - said VW would not comment on an ongoing investigation, adding that the company in recent months had held intensive talks with the Federal Motor Transport Authority. "There are no new circumstances here," he said. Gearboxes and software could be manipulated so that vehicles show lower levels of carbon dioxide (CO2) ...