i had to test mine at the sensor only way i got a reading was when it was set to milli volts on the meter
and in the end i gave up
as i couldnt work out which one needed a seensor
so changed the two fronts and was still the same
so just cleaned the earths up on the sensors and sanded the hub down to get rid of surface rust
put it all back together and job done abs working again and no probs since
