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All you need to know about the Worldwide Harmonised Light Vehicle Test Procedure (WLTP)

Replacing the current but now outdated NEDC test procedure for establishing the official Fuel Consumption and CO2 emissions of new passengers cars, the European Union has developed a new test tailored to accommodate the advances in vehicle technology and ever-changing driving conditions, this will be known as the Worldwide Harmonised Light Vehicle Test Procedure (WLTP).

Manufacturers were required to obtain approval under WLTP from 1 September 2017, however, this becomes mandatory for all new passenger cars from September 2018. Results from WLTP testing will begin to appear on the Vehicle Certification Agency (VCA) car fuel Data, CO2 and vehicle tax tools as all the tests are completed and the data becomes available.

What impact will it have?

The WLTP aims to provide a closer depiction of ‘real-world driving’ fuel consumption and CO2 figures, to provide model-specific values at the point of sale. Differing from the previous and still current NEDC process in many ways, both tests shall continue to be conducted under laboratory conditions allowing meaningful comparisons between cars to be made in the future.

From a customer’s point, NEDC and WLTP figures with increased emissions values, can affect the following:

BIK (Benefit In Kind company car taxation)

VED (Vehicle Excise Duty)

Congestion Charge (or local authority requirements)

WDA ( Writing Down Allowance)

Once WLTP is fully implemented and used for taxation purposes, optional accessories can also have an impact.

Affects of WLTP on car tax?

The CO2 fuel emissions figure will determine the cost of Vehicle Excise Duty ‘car tax’ for new passenger/light vehicles during their first year of registration. For cars approved under WLTP, testing results equivalent to the NEDC will be used and displayed on their databases and access links provided. Eventually, the CO2 value obtained under WLTP will be used instead of the NEDC equivalent. Once WLTP is used to calculate vehicle tax, it will only affect those cars that are unregistered, i.e. the CO2 figure that is used for tax purposes when the car is first registered will not change during its lifetime.

Customer Clarification from Toyota

At Toyota, we feel it is important that you are taken through the change in legislation, detailing how WLTP may impact you.

Due to the change to vehicle testing procedures introduced by WLTP, the fuel consumption figures and CO2 emissions measured are, in many cases, higher compared to those measured under the previous test procedure (NEDC). For cars homologated under the new test procedure, revised CO2 and mpg figures are available from Toyota on request. Please visit for more information.

A consideration that fuel consumption figures quoted under NEDC or WLTP is obtained under specific test conditions. Although WLTP is a closer representation of the figures likely to be achieved in the real-world, variations in driving styles; vehicle accessories and additional weight carried affect fuel consumption that is actually achieved. Figures can serve as a means of comparing models of a similar type at the point of purchase or sale.