It wont help to clean the sensors! As answer 1 stated, a scan test is needed to find the sensor (or wiring) that is failing. Sensor and bearing combo. i am pretty sure! Possible wire or connector problem also!!!!
Yes they can but often replacement is necessary. When the vehicle is shut off the traction light will reset. when turned and driven when the module sees a problem or lost signal with the wheel sensors it will turn on the light back up until it is shut off once again. Have your vehicle tested for codes with a capable scanner. the codes will help you give direction on which sensors or circuits to check.