Its in the middle of my post but I did clean the sensors and exciter ring. They did not look to be dirty, but used a brush to clean the ring and carefully some brakeclean on the senor and ring followed by a good blast of compressed air to get rid of any particles. I do get pulsating voltage from each sensor but I do not know if its the correct amplitude. Does any one know the air gap on the sensor ? Can the local shops read codes or is it a dealer only thing ?