40 CFR 86.409-78 - Defeat devices, prohibition.
(1) Senses temperature, vehicle speed, engine 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 and
(2) Reduces the effectiveness of the emission control system under conditions which may reasonably be expected to be encountered in normal urban vehicle operation and use, unless
(ii) The need for the device is justified in terms of protecting the vehicle against damage or accident, or
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.