The NEDC value of a car suddenly increased, what happened?

CO2 targets that car manufacturers have to meet by 2021 are based on the old NEDC test, the so-called New European Driving Cycle. From the introduction of the new Worldwide Harmonised Light Vehicle Test Procedure (WLTP) in September 2017, the WLTP-CO2 values will be translated back to NEDC-equivalent values to monitor compliance against the CO2 targets set by the European Union.

A ‘correlation exercise’ was carried out by the European Commission to determine how the values for new cars measured on the WLTP cycle will be translated back to NEDC equivalent values for monitoring against the EU CO2 targets. These correlated NEDC values will either be calculated using a correlation simulation tool or based on the results of physical NEDC test.

The correlation tool has limitations that may result in higher NEDC-CO2 values. If the correlation tool does not confirm a manufacturer’s declared CO2 value or the tool is not able to deal with specific technologies, CO2 values from the correlation exercise can be replaced by physically measured values using NEDC.

However, since this will be an updated version of NEDC (with tightened test set-up conditions), new cars that are type-approved under WLTP will have WLTP-CO2 values as well as higher (updated) NEDC-CO2 values compared to the current NEDC.

Transition Timeline: From NEDC to WLTP

  • Cars type approved using NEDC before September 2017 can still be sold.
  • WLTP type approval testing will be introduced for new car types.
  • Some cars will have ‘old’ NEDC values, while others will already be certified under the new WLTP conditions.
  • The industry would like to start using WLTP-based results for general consumer information (eg sales brochures and websites).
  • During the period of transition (up until the end of 2018), only NEDC values should be used on labels and information in dealerships to enable consumers to compare different cars.
  • It is expected that national tax regulations will continue to be based on NEDC values.

The same car suddenly has two different CO2 values, why is this?

The NEDC value of a car suddenly increased, what happened?

  • All new cars must be certified according to the WLTP test procedure, and no longer on NEDC.

Will my fuel consumption increase under WLTP?

  • All cars in dealerships should have WLTP-CO2 values only to avoid any confusion among consumers, in the view of the automobile industry.
  • An exception will be made for end-of-series vehicles to allow for a limited number of unsold vehicles in stock that were approved under the old NEDC test to be sold for one more year.
  • National governments should adjust vehicle taxation and fiscal incentives to WLTP values, respecting the principle that WLTP should not have a negative impact on consumers.

Will WLTP affect how much car tax I pay?

The same car suddenly has two different CO2 values, why is this?

  • The European Commission will convert today’s (NEDC-based) CO2 targets to specific WLTP-CO2 targets of comparable stringency. These new WLTP targets will apply for monitoring car fleet compliance.

Will the new WLTP test affect CO2 targets?

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