LDKutz

The right side blind spot warning indicator erratically turns on and off. The sensing module in the rear fender well has been replaced. When it was removed, it almost crumbled in the mechs hands. Since replacement the red indicator comes on when there is nothing to the right of the vehicle. Is this a generic problem? Is there any history of the proper fix?

Plutoe

Those systems are not DIY, you need factory or equal diagnostic software to diagnose, therefore take the car back to the gent that replaced the sensor.