Freelander 1.8 LTD edition - 2001

[Sioned]

Hi
Ive just bought a Freelander and the Traction control, ABS and HDC lights are on all the time.
I read on the internet this could cost thousands to rectify, is this true?? Does this mean I have been CONNED and the car is only worth scrap?? The guy who sold it said his mate had fitted new brakes and not reset the sensors but would this make all three lights stay on??