You mentioned the episode that got you here was freeway speed but did you have slow speed stalls before? If you had occasional stall at slow speed for example pull into intersection to turn left but have to wait for traffic or while putting through parking lot then throttle off to park but discover the RPM at zero when you pull the key those are classic CPS shot symptoms.

FYI my stall situations: I had maybe 4-5 episodes spread over 2 months. I had SES (MIL / CEL) light on when I bought the car clearly because of CPS. The code self cleared by the time the car was driven to me, but I had a stall with codes about a month in, about 2 months in about two weeks later then about a week after that. When they go they can go slow at first then die quickly. They are very very sensitive parts I would never use a non OEM part for CPS!

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)