I also read about Bosch's involvement but this story was based on a report by the Bild am Sonntag newspaper which is not trustworthy. [1] is an English language source that relays this report. The gist of the story was that Bosch supplied the software for R&D purposes and Volkswagen engineers decided to put it into production cars too.
However, this was later rejected by Bosch who claim that writing additional code is required by the car manufacturer to get the emissions test detection feature [2].
However, this was later rejected by Bosch who claim that writing additional code is required by the car manufacturer to get the emissions test detection feature [2].
[1] http://blog.caranddriver.com/report-bosch-warned-vw-about-di... [2] http://www.reuters.com/article/2015/10/07/volkswagen-emissio...