If you want to change it yourself you'll need a open end wrench and preferably your car on a lift, because you may need a lot of leverage to get it off. I'm sure the parts shop has the part. I recently changed mine, I used a generic 3 wire bosh unit from a local foreign auto parts store(didn't know about this site then). Clipped the wires from the old one and soldered them to the new one. I'm not sure what has to be reset.