Don't neglect the possibility that it may be a software issue. The VAG group company that does the software "Cariad" has a stinking reputation, even within (well actually _especially_ within !) other VAG companies. I mean be prepared to take your car to a dealer to be told the sensors are all perfectly o.k.
Yesterday evening I reversed out of a "fairly snug" car park space, with all the proximity sensors wailing. But when I was clear of the space a lower frequency beep-beep-beep remained. So of course I got out to check there was no small child attached to my bumpers, but all was clear. By now I was causing a traffic jam in the busy car park, so drove on trying to ignore the incessant beeping. But chose a route home where I could park in a quiet but well-lit street to have a look around. Nothing obstructing the sensors. Even turned off the ignition, got out and locked the car, but beeping recommenced when I got in again.
Finally got home with my nerves in tatters, and as I approached the hedge alongside my driveway that I park near, the first genuine sensor beep cancelled the noise that had plagued me all the way home. No, I hadn't touched the hedge and brushed something off one of the sensors, the hedge is freshly trimmed so no bits sticking out.
Now to me that's clearly a software issue. What's really unforgivable is that there was never any explanation of the "alarm" on the instrument cluster, I had scrolled through all options of all 3 areas and you'd think nothing was wrong.
I should mention that this is a Seat Leon Estate, FR Sport 1.5 DSG, registered at the end of August 2024, only 10 weeks ago, just 1491 miles on the odometer.