P0175 (Turbine speed sensor malfunction) stuck in limp home mode (1st gear) on 2000 Mercedes-Benz CLK430

My baby has 61,500 miles on it, this is the first BIG problem I've ever had. I would like to do the work myself,(retired and plenty of time), if this is possible. Where is this sensor located? do I need to do anything special? or would I be better off taking it to a shop??

1 answer
Here is very detail information on this code:

http://repairpal.com/OBD-II-Code-P0172-and-P0175