Airbags and the SRS system
When airbags deploy in a collision, more than just the bag itself needs attention: the SRS module stores the crash event and must be replaced or reset per manufacturer procedure, the seatbelt pretensioners are usually single-use and need replacement, and the steering column, dashboard, and seat structure may need inspection. Skipping these steps leaves a vehicle with airbags that won't deploy correctly in a second crash.