I just got this Wednesday. Works perfectly.

Brand New Parking PDC Sensor for BMW E39 E46 E53 E60 E61 E63 E64 E65 E66 E83 | eBay

To find the bad one I scanned errors in BMW Scanner 1.40, it says which is bad.

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BMWCCA # 480346

'72 e6Tii rip
'90 e30iC sold