Do I need to remove the bumper to replace the entire fog light? Or just pop the casing off?
It depends on the specific make and model of your vehicle. In some cases, you may be able to remove the fog light by simply popping the casing off. In other vehicles, you may need to remove the bumper or other parts in order to access the fog light for replacement.
It's best to consult your vehicle's service manual or an experienced mechanic for specific instructions on how to replace the fog light on your vehicle.
You can also go to the manufacturer's website and look for the repair or replacement procedure of the fog light.