It seems unlikely that Bosch would implemented an algorithm to detect an emissions test and alter the engine behavior. It seems much more likely that Bosch imp

It seems unlikely that Bosch would implemented an algorithm to detect an emissions test and alter the engine behavior. It seems much more likely that Bosch implemented diagnostic features to force the engine into a particular operating mode (e.g. Enable/Disable EGR) and that Volkswagen activated those features when it detected certain qualifying criteria (i.e. emissions test conditions). Unless there's direct evidence implicating Bosch, then blaming them for the cheating is like blaming a bullet manufacturer when you get caught shooting people.