I think we should all go take another good look at the Owner Manual's Parking Aid section before sentencing that something must be wrong with these sensors, as there seems to be a bit of confusion about their correct operation. Just because those in a Mercedes, Jeep or Kia may work differently or be more sensitive, doesn't automatically mean ours must be broken.
Among other things, our manual states that the sensitivity of the front sensors is way, way lower than the rear ones, only about 24" (vs. 60" for the rear center ones when you're backing up.) They are ultrasound sensors, so they aren't infallible and can miss or be tricked by thin posts, non-reflective dark surfaces, parked stealth fighters, dog trainer whistles, etc. They will turn off - and stay off - once your vehicle exceeds 10 mph, until and unless you engage reverse again (or push the button to turn them on manually.) So, if you pull into a garage after a drive that exceeded that speed, you'll crash into that pole in front of you if you are waiting for the sensors to warn you.
My front ones work as expected, meaning they are often off when I need them most - but that's fine. Frankly, they are pretty useless to me even when the are on and beeping like crazy, I can see just fine and judge distances pretty accurately in front of the hood. I'm just a natural at that kind of stuff, must be all the practice I got behind the wheel in the 80s and 90s, before these gizmos for Millennials were invemted to save us from ourselves. That's one bit of semi-useless technology - like swiveling headlamps, rain sensing wipers and digital oil dipsticks - that I wouldn't miss for a second if someone took it away tomorrow. The rear sensors (and camera) are much more useful and actually work automatically when you expect them to - when you are backing up.