The contact owns a 2008 Nissan Altima. The contact received notification of NHTSA Campaign Number: 08V521000 (Air Bags, Electrical System). The contact called the dealer and made an appointment; however, the contact was informed that the part might not be available for the appointment. The contact arrived for the appointment and was informed 3 hours later that the part needed for the repair was not available. The contact was informed by the dealer that several other dealers and was informed that parts were not available. The manufacturer was made aware of the issue and informed the contact that other dealers would be contacted for parts availability, and a case was filed. The contact stated that a week later, the contact called the manufacturer again and was informed that the part was found and sent to the local dealer. The contact called the dealer and was informed that there was no knowledge of parts being sent to the dealer location and that there had not been any communication with the manufacturer about parts. The contact stated that upon sitting in the passengers seat, the air bag sensor failed to recognize a passenger seated in the passengers seat. The vehicle was not repaired. The failure mileage was unknown. Parts distribution disconnect.