2017 Q50 Red Sport 400 RWD
I received another replacement harness today and had no trouble with it locking on either connector. Inspecting the two female connectors, I did see differences between the two.
This is a minor issue but it does show that there is a slight difference in the pin sockets. The one on the left is the one I was having trouble with and the one on the right is good but I don't think that was the problem.
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Here's what I think you need to watch out for. This is the female connector I am having trouble with. Notice that there are three rings of seals (red rings behind release tab).
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Now here's the female connector that works properly. Notice there are only two rings of seals behind the release tab.
View attachment 93636
This is what I think is causing the problem with preventing the connectors from locking together. At any rate, everything clicks and locks and no CEL, so I'm happy.
Good for you! And good detective sleuthing!