I reviewed Bobek AG Opinion in Case C-347/18 Salvoni v Fiermonte earlier. The referring court enquires whether the court of origin tasked with issuing the Article 53 Certificate (issued with a view to enabling swift recognition and enforcement) may, of its own motion, seek to ascertain whether the judgment whose enforcement is sought was issued in breach of the rules on jurisdiction over consumer contracts, so that it may, where appropriate, inform the consumer of any such breach and enable her to consider the possibility of opposing enforcement of the judgment in the Member State addressed.
The CJEU has entirely confirmed the AG’s Opinion (no English version at the time of posting): no such second-guessing of jurisdiction.
At 34 ff the Court points out an important distinction with certificates issued with a view to enforcing provisional measures: there, the court issuing the certificate does carry out jurisdictional review (whether the court ordering the measures has jurisdiction as to the substance of the case).
At 40 ff the Court also confirms that substantive consumer protection laws (such as Directive 93/13) do not transfer to the procedural /jurisdictional rules of Brussels Ia: an important conclusion overall.
(Handbook of) European private international law, 2nd ed. 2016, Chapter 2, Heading 220.127.116.11, Heading 2.2.16.