Hi,
Do you mean there is no resistance in the key itself when you turn it? Does it feel disconnected? I have to be honest, this vehicle isn't offered in the US, so my technical information is extremely limited. However, it sounds like the key lock assembly is detached from the actual switch. On some vehicles, they actually have a linkage arm to connect the two. Others connect directly together.
Are you able to remove the cover on the steering column to inspect the switch? You may find that something is simply disconnected. I'm sorry I don't have specific directions, but it really shouldn't be too hard.
As far as a location, I'm not sure where you are located. I suspect you are in a different country. If it was once fixed by the Opel dealer, I would go back to them and explain they already did it once and hopefully they will discount the repairs. That would also be a good time to ask if there is a common problem with the vehicle type.
Please feel free to let me know if I can help. I do feel somewhat limited, but I'll do my best to help.
Take care,
Joe
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Wednesday, January 8th, 2020 AT 6:49 PM