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Original setup had a radar sensor (hidden) in the middle and 2 ultrasonic sensors in the bumper.
This was changed to the 4 ultrasonic sensors with no radar (cost cutting measure? Never saw complaints about the original sensors).
There were other changes done at the same time. I don't remember all of them but I do remember the omission of the cigarette lighter 12V socket in the ashtray. Most of the changes were trim items and most were cost cutting measures.