During a recent conversion I had problems getting an sensor our .. I had to inflict alot of pain on the hub to remove it.

In the end I made a puller and pushed it out.

Like said tabetha ... Plenty of lube ... Soak it in Vinigar .. Try everything to remove intact.

Once out check resistance with a Mulit-Meter .. Bound to find resistance Values on the internet.

Good Luck.