One problem related to transmission sensor has been reported for the 2005 Mini Cooper S. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Mini Cooper S based on all problems reported for the 2005 Cooper S.
Started vehicle in the morning of 11/14/2012. The shift indicator on the dash shows ep mode instead of d,r,n,etc. The car seemed to drive fine but there's something wrong with the shifter electronics. The car does not seem to know what drive mode is in. Putting the auto manual transmission into sports mode does not change the shift indicator on the dash. In sports modes it still showed ep. In ep mode the car does not rev beyond 3000rpm and drives rough at certain speeds. This may be a manufacturer defect with a transmission sensor, or the shifter electronics.