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Hello I will help,
Front or rear wheel sensor?
Remove the caliper and rotor from the hub
Remove the bolt from the sensor
Pull the sensor out of its mounting hole and unclip the wire from the brake hose then unplug the sensor connector.
Please let me know what questions you have
That makes it more difficult. Can you heat a drywall screw and run it into the sensor? If not start drilling a small hole in the exact center of the old sensor and enlarge it to remove the pieces of the old sensor a little at a time.
If you can't get it to come out you will need a new hub unit.
Let me know what I can do to help
Don't drill all the way through. I would start with a small pilot and a drywall screw, if that wont pull it try enlarging a little at a time. You only want to drill the plastic not all the way to the sensor tip.
If you drill all the way in the junk will get in the bearings so at that point replace the whole hub it will come with a new sensor installed.