Vernon Cook

Hi Everybody, Prob with warning lights on my Disco 2 i.e. Hd - Abs and Tc had a diagnostic check on it, resulting in problem with electrical fault with shuttle valve. The lights are not on all the time, if I switch off and leave it 10 mins they dont appear straight away, I can probably drive either 5 miles or 20 before they come on. So is it doing any harm driving with the lights showing. What the heck does this valve do. And does it sound like an expensive repair. Any help appreciated Thanks.