The 2004 Subaru Impreza has 6 recalls, the most serious being a Takata airbag inflator defect where the passenger-side frontal airbag inflator can rupture and send metal fragments into the cabin, potentially causing serious injury or death.
Prior repair attempts have not fully resolved the inflator issue for all vehicles. One recall specifically covers cars that received a replacement inflator under an earlier campaign, where the new inflator may have been installed incorrectly. An improperly seated inflator can fail to fully deploy the airbag in a crash, reducing the protection it is meant to provide.
On the engine side, the cover bolts for the oil control valve may not have been tightened enough at the factory, allowing oil to seep out around the cover gasket. If that leaking oil reaches hot engine components, it can ignite and start a fire in the engine compartment.