Best to get hold of a multimeter and carry out the checks before changing anything else.
It is easy to add faults to the ABS system when replacing parts without a correct initial diagnosis.
On my car the fault was a slightly too large air gap between one of the rear sensors and the magnetic reluctor - both aftermarket parts. Checked the mounting was rust free and clean and then filed 1.5mm off the back of the bracket to move the sensor a bit nearer and it worked perfectly.
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