113That interpretation is also supported by the objective pursued by Regulation No 715/2007, which is to ensure a high level of environmental protection and improve air quality within the European Union, which entails the effective reduction of NOx emissions throughout the normal life of vehicles. The prohibition laid down in Article 5(2)(a) of that regulation would be devoid of substance and deprived of any effectiveness if car manufacturers were permitted to equip motor vehicles with such defeat devices with the sole aim of protecting the engine against clogging up and ageing.
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