Thanks frenzke68! You give us all hope
I have ordered a lambda. I let you know if it work on my car, when I have chanced it.

For information, it doesn't work to chance suction pressure sensor (if the name is that in English). My dealer thought it was that, but the error code appeared again after just two week or something like that.

As previously described, error code 89 showed up more frequently when it's cold outside. When the code appears, often during acceleration, the car looses power for a couple of seconds. And now the car even have higher fuel consumption than normal.

(Sorry for bad English, to lazy to use google translate right now.)