After replacing the flex steering coupler the EPS an ESP lights turned on

Hi,

First, there is a technical bulletin regarding this component. If I understand correctly, Kia is replacing them free of charge. It isn't a recall, but they recognize a problem.

As far as the new problems you have, the system needs to be recalibrated after doing the work. You will need a scan tool that can communicate with the modules involved.

I attached the recalibration procedures below.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.