One problem related to transmission fluid leaking has been reported for the 2003 Mini Cooper. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mini Cooper based on all problems reported for the 2003 Cooper.
The car would not easily shift gears. When I brought it to the Mini Cooper dealership, I was told that all of the transmission fluid leaked out of the transmission. The transmission is "sealed", so the transmission fluid cannot be checked or changed. I was told that I needed to replace the transmission and clutch. The car should not have a sealed transmission if it can develop a leak so easily.