Replace the column as i have just done on my daughter's. The EPS power steering is a well known Achilles heel of the K12 Micra and is the reason many have sadly been scrapped.
No one in their right mind goes to the dealership and spends 4 figures, I paid £ 190 plus postage and it took me 2 hours to change in total.
Anyone with average DIY skills and a socket set can do it. The only thing you might need to buy is a T30 torx bit for the steering wheel fittings and that should cost less than a tenner on Ebay.
