325 TDS traction control/ABS light

[shrekky]

the traction control and ABS lights came on at exactly the same time,now I've read a few posts on the site already,and i know the two are inter-linked but my question is, is it more likely to be a traction control sensor or a ABS sensor which would have triggered them both to come on at the same time ? just need a starting point on where to look