Another datum point, we also have a 99 BMW Z3.

Last year I had similar problem with that car. The rolling codes got out of synch and the car refused to start. The final fix was to send the ECU to a company that spoofed the ECU into seeing the OK-Dokey from the key/transponder/DAS making the key RFID chip irrelevant.

So far, I have not found a company that can do this for a MB.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles