Can some one help me. Discovery II 2001 ........ Ive been replacing parts and clearing codes for 2 months. Im down to the final; last code P1590 manf cntrl veh.spd idle speed control Auxillary inputs

There are no lights on, no check engine light however I do have this code come up straight away after clearing the codes. Do I have to drive the vehicle some miles to get rid or do I change more sensors.

I have tried for hours upon hours searching and googlin but nothing specific to this code reading.

You help will be much appreciated

 

Any luck? I also have a 2001 D2 with this code..