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90% of problems on modern cars are computers miscommunicating with other computers, out just deciding that some sensor isn't behaving well enough, so you have to throw the baby out with the bath water. All this in proprietary formats in proprietary subsystems a filthy mortal like you can't afford the tools to even know what's wrong.
And then you can get 3rd party tools like Autel, which also aren't cheap. But this model of tool can only talk to these modules on this model of car. Any car that requires a scan tool to bleed the brakes can go straight to the crusher. Oh and let's run all of the buses through the radio so you can never change that out without a dongle to try to keep things working.