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If ICV keeps buzzing even when key is removed, that means the ECU (Motronic) is still powered on, while it should be switched off. If you have changed the DME relay and the issue is still the same with ICV permanently buzzing, my guess is that DME relay terminal 86 gets 12V power from the anti-thieve unit while it shouldn't. Check voltage at this terminal. If you see 12V then your next check is the anti-thieve unit.
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Gilles
RoW 88 Carrera coupé
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