2.
The use of defeat devices that reduce the effectiveness of emission control systems shall be prohibited. The prohibition shall not apply where: the need for the device is justified in terms of protecting the engine against damage or accident and for safe operation of the vehicle; the device does not function beyond the requirements of engine starting; or the conditions are substantially included in the test procedures for verifying evaporative emissions and average tailpipe emissions.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.