Anziani ...did you resolve your issue? Do you have ASR or ASD? ASD won't cause limp home mode ...don't know about ASR ...sounds like something bigger going on.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg