My C280 will not shift out of 2nd gear. It hits hard on R and D when I shift out of park. I noticed the day before this happened that the car did not downshift properly a couple of times. I also had a exterior lamp failure light come on in my dash a couple of times about a week or 2 ago..with no light out...I don't know if this could in any way be related. I had a shop run diagnostics and they said it showed an O2 sensor problem and a turbo-turbine problem...but my car is not turbocharged. They seem to think the O2 sensor is not the problem and are going to replace the "range selector switch". Has anyone had any similar problems? Any help would be much appreciated.