Ford has launched an investigation into the actual emissions of its vehicles after employees reported errors in data given to authorities, the automaker said. “In September, a handful of employees raised a concern… regarding the analytical modeling that is part of our US fuel economy and emissions compliance process,” Kim Pittel, an executive responsible for sustainability, environment and safety engineering, said in a statement released late Thursday. “We have hired an outside firm to conduct an investigation” into specifications used in testing and “applications to certify emissions and fuel economy,” Pittel said.