Engine management light

Right guys i have a problem, whenever i turn my wheel one full turn left the engine management light comes on along with check esp, check abs and i lose all traction control. I cant get it in to the garage for atleast another week was just wondering if anybody had any ideas as to what might be causing this?
 
maybe a loose connection on the wheel speed sensor when moving to full lock.

they are clipped onto the track rod ends. easily accessible to check. i would start there
 
could be a faulty steering wheel angle sensor - this is used to supply data to the esp system