I just replaced mine and opened it up. Quite simple of a sensor. Based on the inner workings, 99.9% of the time its going to be small brushes that touch an inner ring. These small delicate "fingers" simply wear down. I heard of someone taking a junk yard part and replacing the worn part to his success. After seeing mine, I could believe it being a viable option. Probably save $150 that way in parts. But overall not a difficult thing to try to do.