Steering Assist Fault - Service Now. Seeking help from a tech/ideas on causes

[fpa1974]

One thing to tuck away in your memory banks if you run into a problem like this again: If a complex system has worked correctly for long enough that you have confidence that it works, and then it stops working, it's extremely rare for there to be more than one thing that's actually wrong. Step back and ask yourself the question "what single thing could cause all these symptoms?". In this case, there were loads of diverse symptoms, but there was only one actual problem that caused them all - the wiring harness had the wrong part number.

Great advice! Another thing that helped me over and over in situations like this (not just cars or electronics) is to ask what change(s) I made right before it stopped working - and have them rolled back to eliminate potential unintended consequences (if possible of course). All is well that ends well

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