People who don't know how to use computers treat them like a magic box that may or may not do what they want to, if they use the right magical incantation.
Computers inexplicably don't do what you want them to do all the time, though. Modern cars, by contrast, are incredibly reliable even with extremely insufficient maintenance.
Car analogies applied to computing tend not to be very good, at least partially for that reason.
Are these parts not part of the car?
And then there is the stuff that is often different car to car, like where lights are, how to adjust certain settings. Want to pair the Bluetooth in your Mercedes to your phone? I consider myself extremely proficient at computers and absolutely know how to use one in almost any capacity and even I’ve struggled with its lunacy (which is much more a reflection on Mercedes bad in-car systems that vary model year to model year and can differ based on what options your dealer ordered).