BMW, Mercedes-Benz, Porsche, Volkswagen and others have already been forced to stop selling their plug-in hybrid models such as the Passat and Golf GTE, as well as the Panamera and Cayenne hybrids. Interestingly, the Mitsubishi Outlander PHEV meets the new WLTP standards.
The problem here is that the WLTP plug-in hybrid tests differently than the old rules. The new test effectively reduced the battery range for plug-ins, which in turn increased CO2 emissions to over 50 grams per kilometer. If a car is valued at more than 50 grams per kilometer, it loses its tax advantages as a low-emission vehicle and can no longer be sold at a nice discount.