It was the perfect storm: three Model S fires in six weeks were enough for the National Highway Traffic Safety Administration (NHTSA) to start an investigation into the two US fires in mid-November, but as it turns out, the German government was paying attention too. According to Tesla, Germany's Kraftfahrt-Bundesamt (KBA), or Federal Motor Transport Authority, already has completed an investigation into the two US fires and the one in Mexico, found no manufacturer-related defects and will not take further measures.
According to a statement issued by Tesla, the automaker says it was contacted by the KBA about the post-crash fires, and it "provided the KBA with data and additional information regarding each of these incidents." The KBA subsequently sent a letter in German to Tesla saying the investigation was complete and that no manufacturer-related defects could be found. (Take a look at the letter here.)