Modern cars are basically networks of rolling computers. When a dashboard light...

https://www.bookmark-friend.win/gone-are-the-days-when-you-could-fix-every-car-with-a-wrench-and-a-test-light

Modern cars are basically networks of rolling computers. When a dashboard light pops on, a cheap code reader only shows you a vague surface fault. To actually fix the car, you need software that talks to every ECU and tracks live data streams