# The Road Vehicles (Registration and Licensing) Regulations 2002, Paragraph 4A: ...

Extent: E+W+S+N.I.

This paragraph applies to an eligible vehicle which—
(a) is registered before 1st October 2009; and
(b) complies with the requirements of paragraph 4B as a result of—
(i) its design, construction or equipment as manufactured; or
(ii) an adaptation made to the vehicle after 30th September 2006 which—
(aa) affects the durability or in-service conformity of the engine control system,
(bb) affects or introduces an on-board diagnostic system,
(cc) affects or introduces a sensor for the detection of oxides of nitrogen, or
(dd) otherwise concerns the system for controlling or managing the emissions of the vehicle.

---
Source: https://www.legislation.gov.uk/uksi/2002/2742/schedule/2/paragraph/4A (the official version)
Page: https://openlegislation.uk/road-vehicles-registration-and-licensing-regulations-2002/schedule-2/paragraph-4A
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.