thank you very much ILUVMILS fir this quick reply.

This is exactly what I am suffering from especially under very cold wheather conditions:"" There is indeed a moisture issue, like severely fogging windows when the car is parked, you may have water getting in."

Once it has induced SEVERE ERROR messages o multiplexing system (Battery, EBV, ESP, ABS, etc...) on the display and the car had to be towed to the dealer They spent 6 hours for investigations including computers resettings (???) and solve the problem.

I am also suspecting the trunk tho not be water tight on the gasket side. i have to find out

Regards

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Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km