Older ones do, newer ones have a diagnostic port you plug an adapter into for use.

You don’t need to use it unless you are rewriting modules or performing certain diagnostic tests because the center display has access to all the information you would need via a diagnostic mode.

The data available is extensive, you can look at fault codes, and perform standard maintenance procedures like coolant bleeding. Listing what data is available would take entirely too long because it is literally everything the car monitors.

Supposedly the diagnostic mode has more features if you are in a service center, but I can’t confirm that.