NEDC 1.0: All cars registered prior to 1 September 2017 have been approved in accordance with the New European Driving Cycle (NEDC) fuel consumption and emission test, which has been in force for decades.
WLTP: All new models put onto the market from 1 September 2017 and all cars registered from 1 September 2018 onwards have been tested in accordance with the new Worldwide Harmonised Light Vehicle Test Procedure (WLTP), the emission values of which are closer to reality (and therefore significantly higher).
NEDC 2.0: To ease the tax transition, it has been mandatory for car manufacturers to use this value after the WLTP came into force. This value is obtained by converting the result of the WLTP to the old NEDC standard using a formula legally established in Europe. NEDC 2.0 values are lower than WLTP values, which reduces the tax impact.