Disco 2 Traction control problem!

Hi, Thanks for the inputs - I learn all the time .Early on in the fault finding, I checked tyre pressures & even swapped the two front wheels over with each other. I also checked the level of the diff oil. I'm not aware of the ECU being re-mapped.
The situation is that if I drove 100miles miles on a straight smooth road, the sensors would be within tolerance. If I drove in left hand circles for a

....ages, the sensors would be within tolerance. When I turn to the right, the voltage from the sensor is weaker on the O/S/F hub and out of tolerance therefore causing the problem. I'll work on that.