I was dealing with the same variety of codes after swapping out my rack with one from an Audi. I swapped the rack because of a popping sound in the steering wheel. The swap was overall straight forward like you said but I was hitting a wall until I found your write up. I used my obd11 to work through the steps and it worked.
Pros: straight forward swap
Cons: popping sound
Vehicle:
Volkswagen
