In order to replace the front PDC sensors it is necessary to remove the bumper cover. That requires loosening the screws that attach the cover to the fender and for that you need to remove the plastic rivets holding the black fender trim and the wheel liner. Then remove the nuts that secure the botom cover. There are also 4 torx screws securing the cover near the radiator. If only the sensors from one side are bad you don’t have to remove the bumper entirely, just the side that needs replacement. Hope this helps anyone.
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