hi
i checked ohms and ac voltage on all 4 sensors and found that n/s/f and o/s/r werent reading at all, so i went down fords and they wanted £103 eh .
then i remembered the 4x4 at the breakers went and had a look and found them in good con and giving good values so had the lot for £10.
got back fitted them and now it all works lovely , so thanks guys for the input to helping me fix it

mark