vance, you will notice some sensors have a sensitivity trimmer you can play with and check the LED sensor switching state on and off. Can also change sensor distance to target and/or parameters in software before deciding the sensor is damaged, matter of fact they rarely need to be replaced. One more thing I don not advise you play with the vacuum sensor programming which is quite complicated just leave this one alone. If there's a vacuum problem check pump efficiency/leaks/hisses first.