Signs of a bent car frame include obvious damage at the point of impact from an accident. A rear collision often leaves visible damage at the back of the vehicle.
An accident also may damage the frame in indirect ways that are not obvious and should be assessed by a professional. Car frames are engineered to absorb the impact from crashes to protect passengers. Used cars with frame damage are sometimes bought and sold because the damage is not always easily detected. Some unscrupulous car dealers make cosmetic repairs to cars that have been wrecked without adequately repairing frame damage. Even a minor crash that damages a car's frame can cause safety issues. Changes to the frame can impact air bag deployment and the vehicle's alignment.