A method is provided for exchanging a section, in particular a damaged section, of a plastic component. The method includes: separating the section from the plastic component; providing at least one connecting element made from a plastic; pressing the at least one connecting element onto the plastic component such that the one connecting element abuts a remaining part of the plastic component; oscillating the connecting element by an ultrasonic sonotrode; and welding the connecting element to the remaining part of the plastic component; providing a replacement section for the separated section, wherein the replacement section has a hole, in particular a through-hole; applying the replacement section in the region from which the separated section was separated, such that the replacement section is clamped by its hole directly in a form-fitting and/or force-fitting manner onto the connecting element and/or the connecting element extends at least some way through the through-hole, wherein a clip element is clipped onto a section of the connecting element extending through the hole. The clip element projects beyond the through-hole and connects the replacement part to the remaining part of the plastic component in a form-fitting and/or force-fitting manner.