FAQ - Air pollutant emissions standardsEuropean Commission, 25 September 2015. Quote: Article 5 (2) of Euro 6 Regulation 715/2007/EC prohibits the use of defeat devices. Article 3(10) defines defeat device as any element of design which senses temperature, vehicle speed, engine speed (RPM), transmission gear, manifold vacuum or any other parameter for the purpose of activating, modulating, delaying or deactivating the operation of any part of the emission control system, that reduces the effectiveness of the emission control system under conditions which may reasonably be expected to be encountered in normal vehicle operation and use.
