Rover 75 abs ecu also provides speedo pulse from front off side wheel so if you still have a speedo you can count that one out as faulty.When you turn on ignition abs light should come on for a self test then go off.If it does this but comes on when car moves then a wheel sensor has gone down.Check wiring to front sensors as they tend to rub against the wheel on full lock.Sensors are about 60 quid on e bay but are a bit of a bi*ch to fit.Remove the locating screw and pull out the old unit but before you try and fit the new unit rub down the plastic rib on the sensor body with a file or the buggers wont push into the hub carrier but don't take too much off.
hammy
September 2010