On September 17, 2026, my 2018 Nissan was involved in a severe rear-end collision on the freeway. The vehicle sustained extensive rear-end damage and was subsequently determined to be a total loss. None of the airbags deployed during the collision. Immediately after the crash, I believe I may have briefly seen an airbag-related warning or message on the instrument panel. However, I was extremely shaken at the time and cannot confirm the exact warning or wording that appeared. The rear of the vehicle was severely damaged. After the collision, I observed an exposed component in the damaged rear area that appeared to be associated with the vehicle's sensor or safety system, and this area had been directly impacted in the collision. I cannot independently confirm whether this component is an airbag/crash sensor. I am concerned about whether the airbag/SRS system functioned as designed during this collision. The vehicle damage has been documented with photographs, and the crash was documented by law enforcement. I am submitting this complaint so that NHTSA can evaluate whether the airbag/SRS system operated properly and whether there may be a safety-related defect.