Measuring resistance will only tell you if the wire to the sensor is broken.

What you really want to measure in order to find out whether it's a wheel speed sensor related problem is voltage.

You can do this directly at the multiplug that goes into the ABS control unit behind the glove box. Get yourself a wiring diagram and find out which pins are for which sensor (or take a photo of the plug and I might be able to help you out). Let someone else drive the car while you measure the voltages (AC!) created.

They should be equal on all 4 wheels (except when the car is turning). The values will proportionally increase with speed. On my 4x4 I measured 0.1 - 0.2 Volt when the car was just rolling and about 0.5 - 0.7 Volt at 25 mph.