> From an engineering perspective, it is very convenient (and reliable) to have everything in the car just sit on a communication bus and write software to do t

> From an engineering perspective, it is very convenient (and reliable) to have everything in the car just sit on a communication bus and write software to do the logic, rather than have dedicated wires or mechanical connections. I would say that some repairs are _easier_ now. The computer can tell you about many issues it knows about. You can see if a cylinder is misfiring. Or if the O2 sensor is bad. Etc. Just have to plug in a reader. It would be great to have some standardization and open documentation on this. But it beats dismantling stuff and trying to figure out by trial or error (or by listening to sounds)