I just changed my sensor and had to drill it out as well. The error on my code scanner showed open sensor before I changed it then went to a right rear sensor failure after. I was real careful when I drilled this out and even put tape around the drill bit about an 1/8 inch less than the length of the sensor as not to go to far. I figured that a piece broke off in the hub so I ordered a new hub thinking the magnet was damaged like stevend510. When I pulled it off, there was the tip of the old sensor and a small piece of the magnet was gone which is likely what happened to stevend510. The lesson to all of this is that if you need to drill the sensor out, remove the hub to make sure all the old sensor is gone. This is a lot of extra work but at least it will likely save you from buying a new hub..