I have looked for this part*(rpm sensor) online and gone to several auto parts stores and there does not seem to be such a part but the volvo dealer claimed this part needs to be replaced at an extremely high price. Is there another name for this part? And how difficult is it to replace?

 

Welcome to VF. Give us a call at 1-877-634-0063. We can get you the part for a lot less then the dealer.