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Probably the ref sensor. If and when you're ready to change it out, do the speed sensor as well....they're both the same. Be careful to:
1) not move the sensor position bracket when removing and installing the sensors. Not a major deal, but you'll avoid having to space the sensors properly upon installation.
2) make sure to not mix up the connectors to the harness in the engine area, and
3) buy the identical but considerably less expensive BMW part (BMW part number 12-14-1-708-619-M14) and save some big $$$$
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STONE
'88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended. 
Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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