hi guys really need ur help here.......

i got a clk 320 2002 , auto tiptronic , the engine management has put the geardox into 2nd gear ( safemode) , wats it is doing is slipping out of gear and engine free rev's , and engine over rev's and jums into another gear , and no its is not changing from 2nds.
a chap has come out and ran a diagnostics on it and its come up wit a error which is : 102 ' gearbox inlet sensor ' the dianostics have reseted the ' engine check lamp' but still has the same problem............. any ideas ?????