In the EU, vehicle manufacturers are required by regulation 2018/858 to give access to diagnostic tools to any repair shop. See Article 61 of 2018/858 [0].

At the moment it's a bit of a pain but there's an upcoming amendment to standardise the access process.

[0]: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A...