Whether the bumper should be repaired or replaced depends largely on the extent of the damage. Typically, repairs can be done for more superficial problems, such as scratches, minor dents, or looseness.
However, more severe damage can weaken the integrity of the bumper. If your bumper has large cracks or holes, major dents, or has experienced damage to the inner structure, it should be replaced.
Today’s bumpers also house various sensors, lighting controls, and even cameras. As such, even a minor collision could damage these systems. A more severe auto accident could result in damage to the suspension and frame, even if the bumper reduced the impact. Always have your vehicle checked out by a professional mechanic after an accident.