Case C-169/20: Judgment of the Court (Ninth Chamber) of 2 September 2021 — European Commission v Portuguese Republic (Failure of a Member State to fulfil obligations — Article 110 TFEU — Internal taxation — Discriminatory taxation — Prohibition — Second-hand vehicles imported from other Member States — Component of the registration tax calculated on the basis of carbon dioxide emissions — Failure to take into account the depreciation of the vehicle)