True, but people who buy expensive cars care, which is exactly the target for such a system I imagine. I am not a mechanic but can at least hazard a guess at w

True, but people who buy expensive cars care, which is exactly the target for such a system I imagine. I am not a mechanic but can at least hazard a guess at what's wrong with a car from the way it sounds with reasonable confidence. I imagine a purpose build AI design by the car's manufacturer with multiple microphones in the engine compartment and around the car could gain quite a lot of insight, perhaps even outside of identifying maintenance problems simply to tune the performance of the engine, especially when combined with other sensors. Having said that, we seem to be near the end of the line for ICE vehicles, so I wouldn't hold my breath for such a system to be developed.