Cheap fix for brittle crank sensor connectors ↗
When the old Motronic crank/reference sensor plugs crumble, you may not need new sensors: the author sourced both mating connector halves from an electronics distributor for under $20 and shows the swap.
Tools mentioned: Crimp tool, replacement connector housings
Shown during an M30 (E24 633CSi) engine swap; check your connector type before buying.