The contact owns a Nuna Baby Safety Seat, Model Number: CS05107RFD, Model Type: Rava, And manufacturing date: N/A. The contact stated that while the car seat was being utilized, the front harness adjuster was loose intermittently. The contact later received notification of NHTSA Campaign Number: 24C002000(Child Seat), which the contact related to the failure; however, the part to do the recall repair was not yet available. The manufacturer was contacted and informed the contact that the part was not yet available for the recall remedy. The manufacturer advised the contact to discontinue the use of the car seat. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The car seat failure was not corrected.