4ws Speed Sensor problem

[91SVX]

Hi,

I've got a problem whereby the 4ws light comes on as soon as the car starts moving. I've pulled the error codes and it shows code 11, a faulty speed sensor.

The car has been converted to manual using a Legacy gearbox and am not sure if it is to do with the conversion. The speedo works fine which i guess means the speed sensor is fine. Is there a separate one for the 4ws?

Thanks very much

John