New reports from the US suggest that Volkswagen may have developed several types of its infamous “defeat device,” which may even be equipped on its newest range of vehicles.

Previously, the defeat device used to achieve “targeted results” in official emissions tests was confirmed only to be fitted to the brand’s vehicles equipped with the EA189 2.0 litre EU5-compliant diesel engine.

As discussions continue to try to resolve the 11 million affected vehicles, a new Reuters report suggests that the carmaker may have developed several types of the defeat devices, even one for its latest 1.6 and 2.0 litre EA288 diesel engines. These are in use in the latest-gen of MQB platform-based vehicles, such as the Mk7 Golf, new Tiguan and next-gen Jetta.

Three unnamed sources – one a VW manager, another a US official close to the ongoing investigation – are believed to have been in touch with Reuters, and have opened up on further complexities surrounding the German automaker’s recent discrepancies.

Volkswagen Tiguan-11

As mentioned, it is reported that several more types of defeat devices were developed by Volkswagen, based on the premise that different, newer versions are required for different engines, and for different emissions control systems as well. A source close to the ongoing investigation in the US said that, “Volkswagen would have had to reconfigure the software for each generation of engines.”

Suspiciously, Volkswagen of America has since pulled the plug on its newer diesel-powered (EA288-equipped) vehicles being certified for sale by the Environmental Pollution Agency (EPA). It also doesn’t help that the company has also issued a stop-sale order of its 2015 and 2016 model year vehicles throughout the country, for models beyond those equipped with the known defeat device-equipped EA189 engine.

Naturally, it wouldn’t be too surprising should Volkswagen actually have an improved version of the defeat device fitted to its newer EA288 engine, a EU6-compliant turbodiesel available in displacements of 1.6 and 2.0 litres.

In the past, Volkswagen has put the burden of its deception on a few software engineers, but should the scale of operations suggested by the reports above be true, there could be a far more sizeable amount of Volkswagen employees knowingly involved in the development of the illegal “defeat devices,” therefore affecting the total amount of potential fines, and the severity of management changes that could be required at Volkswagen.