Rear ended a young lady today, number plate shattered and plate holder came loose too....no other damage but then realized that sensors were not working and doing the following: :turned on car put obstacles in front and rear, the PDC light was flashing green instead of solid (normal). when turned on it let out a long beep.

so must be my bump either broke a sensor or cable, can the cabling be got too easily.....would they all go stop working if one went wrong? I did the check to see which ones clicked and low and behold one of the front ones does not click and it is loose in the bumper alas....can this simply be pried out without taking the whole bumper off and replaced? bit odd that if one is sensor has gone the whole system is stuffed

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N