art_4__para_2
2. From 1 October 2008 for new type-approvals and from 1 October 2009 for all type-approvals, a compression-ignition or a gas engine type-approved by reference to the emission limit values set out in row B2 or row C of the tables in Section 6.2.1 of Annex I, or a vehicle propelled by such an engine shall be fitted with an OBD system that signals the presence of a fault to the driver if the OBD threshold limits set out in row B2 or row C of the table in paragraph 3 are exceeded. The OBD system shall also include an interface between the engine electronic control unit (EECU) and any other engine or vehicle electrical or electronic systems that provide an input to or receive an output from the EECU and which affect the correct functioning of the emission control system, such as the interface between the EECU and a transmission electronic control unit.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.