Commission Directive 91/663/EEC of 10 December 1991… Article 4
Article 4
A Member State which has granted EC type-approval shall take the necessary measures to ensure that it is informed of any modification to any parts or characteristics referred to in item 1.1 of Annex I. The competent authorities of that Member State shall determine whether further tests should be carried out on the modified vehicle type and a fresh report drawn up. Where such tests reveal failure to comply with the requirements of this Directive, the modification shall not be approved.
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CitationArticle 4 of Commission Directive 91/663/EEC of 10 December 1991… (LawPlayer, data as of 2026-07-04)