Why do some "shadow" codes erasable and others are not? I have a driver's side airbag "shadow" code that is currently not active - no fault (mechanic worked on the door and triggered it, but cleared it and no airbag light currently on the dash) and I can't clear it with the BMW scanner V1.4 tool. Is it a time based error such that it will eventual erase itself after a certain amount of time when there are no longer a fault detected? Or would I need something like INPA to clear it? Thanks.

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2004 X5 3.0i
Born 02/04
Delivered 03/04