As 400Eric pointed out, if the MB techs really knew what they were doing, I have to question why they didn't notice that the engine wiring harness was toast. This is such a common problem for that vintage car.

The home brew scanner really does work--I used mine last night. But if you have a bad wiring harness, it's probably not going to do you much good, because a bad harness will cause all kinds of weird things to happen to your car.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles