Many code troubles + doubt

[Christophe.m]

Today I've put the tester for check 2 problems...

FIRST : one month ago when I m was on the race track, waiting on the pit lane before go on the track the transmission light is lit when I started the engine... I turned off and start again and the light disappeared...

SECOND : I'm was driving on the freeway at 120km/h at low load and the engine light turner on... I tried to turn off and on the engine but the light was still here.

So today I saw than the transmission code was:

- '' Error gear selector ''
- '' heated oxygen sensor second row Befor catalyst )

( sorry I haven't check the code number )

My question is : These are known problems ?

- for the SMG, is that the '' beginning of the end '' ( my car has 53'000 km )
- for the Oxygen sensor, does you would change the both sensor or only the defective ?


And I have also an other BIG question !

I feel than my clutch slips a little bit at ''cold'' and after 3-4 upshifting everything is ok the clutch is very aggressive...

So I begin to look some informations about it and I saw on internet that apparently the CSL get many problems with the SMG. I heard than BMW has a new Soft where the shifting is faster, more aggressive and the clutch slip less...

So I went to BMW for ask about it and they told me than I have to change my whole gear box because it's a disease on the M3 and my light announced the beginning of the end.

And they told me than there isn't any new soft from BMW... And it's often a source of problems to update the Control Unit...


Does someone can help me ?

thank you