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US spec cars only have rear PDC so I doubt your car ever had the front sensors. Never heard of anyone having the button that disappeared upon redelivery in the US but your system is working as it should on a US spec car. Front PDC can be had on a Euro spec car.
Not familiar with the HDC feature, not sure if it comes on the M3. I know my wife had it on her old X5...
Edit: Just looked at the M3 manual online and it shows HDC. Perhaps it is a Euro spec option as well...
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2021 X3 M40i
1974 2002tii, Inka, 5 sp manual
BMWCCA # 327475
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