If you have a abs light on consistantly and you check the code and it says front wheel sensor, it may not be damaged, but just need to be cleaned. So to check if yours in dirty follow this article and it may solve your problem.
Tools Required: Rachet 10mm Short Extention Jack Jack Stands Wheel Lock Rag or Paper Towels
1) First start by removing the front wheel for either passenger or driver side depending on which one you start with. Make sure to support your car on jack stands and not just the jack.
2) Next turn the steering wheel all the way in, opposite the side your working on. For example if your working on the passenger side, turn the wheel all the way towards the drivers side.
3) Locate the abs wheel sensor which is directly mounted onto the knuckle and then remove the two 10mm bolts that hold the abs sensor directly. Then along the line theres another two 10mm bolts, that need to be removed, just follow the abs sensor line to get at them. Three of the four bolts are pictured below.