art_31__para_4
4. In order to verify that a vehicle, system, component or separate technical unit conforms to the approved type, the approval authority that granted the EU type-approval shall take the necessary measures to carry out the checks or tests on samples taken at the manufacturer's premises, including production facilities that are required for EU type-approval. In accordance with Annex IV, the approval authority shall take the necessary measures to carry out such checks or tests with the frequency set out in the regulatory acts listed in Annex II, or, if no frequency is specified in those acts, at least once every three years.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.