footnote__3
(***) Article 4(1) of this Directive provides for the monitoring for major functional failure instead of monitoring for the degradation or the loss of catalytic/filtering efficiency of an exhaust aftertreatment system. Examples of major functional failure are given in sections 3.2.3.2 and 3.2.3.3 of Annex IV to Directive 2005/78/EC.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.