your going to have to try a sensor
for best access take the brake disc shield off.
They do like to rust in - spray penetrating fluid and let it soak in, then with grips try twisting the sensor back and forth. if your lucky it will come out in one piece.
If it brakes up, you just need to dig that thing out of there - I had one break while doing my suspension, I used blow torch and dug it out with a screwdriver.
Clean out the hole, iirc an 8mm drill bit is perfect size for top 2/3rds of the hole - it narrows further down
Grease the new sensor and push it into place