[LeifCarrotson]

Audio is an incredibly rich feedback mechanism for all kinds of mechanical processes. And the fascinating part about it is that our brains process it so effortlessly. If the data your ears can analyze from your car were presented visually, perhaps as a scrolling FFT spectral graph or plots of a host of sensors, you'd never notice a momentary misfire or a tiny change in pitch. It would be complete data overload! But even untrained ears can pick out errant noises.