Hi mate,i removed 1 of Duey's ABS sensors today(to change the rear wheel bearing),not very easy to get out mate
But try this,first soak it in WD40 for about 5mins(going back and re-applying a couple of times),then remove the 12mm bolt.Then with a flatbladed screwdriver and a hammer,gentley tap the screwdriver under the edge of the sensor and gentley work your way all the way around(as best you can),then on the next pass tap the screwdriver in a little further,using it as a wedge and keep repeating this until it wont go any further
Now you should be able to use the screwdriver as a lever,again work all the way around
Takes a while mate but trust me it does work :!: