DS3 faulty rack abs esp faults nightmare

[Ds3ste]

I have a 61 ds3 power steering rack failed I have a basic code reader told me no communication with steering ecu changed the rack for a used one all works fine power steering faulty warning has gone but still flashes abs esp fault stop wen I scan this it comes up power steering fault and will not clear also has a airbag ignition fault on drivers which wasn’t there before changing the rack