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How do i clean the crank sensor, TDC sensor

  E39 530i
My revs are sticking between 1,500 - 2,000rpm. Anyone got a idea how to clean the TDC sensor / crank sensor as eveyone is saying this is the problem.

Pictures and an idiot guide to doing this would be great guys.

Please help.
  172 MKII FF
Was this problem ever sorted because I think i need to clean mine, the car sometimes cuts out when just starting OR the revs die out. I really don't want to take it into another garage.