My abs traction control light r on n 4x4 is temporarily disabled. Scanned the truck n came back front left abs sensor n right rear but right rear only coded out only once. I cleared computer n took the truck for a ride which resulted in lights coming back on. Scaned it n only frnt left abs sensor. Replaced it n light is still on. Going to replace rear right now. Why is my 4x4 disabled? I'm thinking about cleaning the sensor first b4 replacing it.