Those suspicions that Volkswagen cooked up more than one defeat device to cheat on emissions tests? They may be well-founded. Reuters tipsters claim that the car maker produced "several versions" of the gadget to suit different diesel engines. VW isn't confirming anything (it's still in the midst of an internal investigation), although it makes sense. The company has had different variants of TDI engines over the years, and different regional emissions standards would have required at least modified software.