Very different from BMW and Audi. Those have a huge third party parts market, and independent shops have full access to the car.
The official diagnostic software from BMW is available for only $2700 per year. Plug it in, click a few buttons and it tells you exactly what is wrong with any BMW, troubleshooting steps, diagrams of the parts and what parts to order etc: https://bmwtechinfo.bmwgroup.com/
If you're not an official shop and don't care about the legalities, the same can be downloaded for $10 at home...
The official diagnostic software from BMW is available for only $2700 per year. Plug it in, click a few buttons and it tells you exactly what is wrong with any BMW, troubleshooting steps, diagrams of the parts and what parts to order etc: https://bmwtechinfo.bmwgroup.com/
If you're not an official shop and don't care about the legalities, the same can be downloaded for $10 at home...