Recalls 2 and 3 describe the same underlying defect (missing igniter material in the passenger airbag), so I'll treat those as a single issue. Recall 1 (fire risk from overheating amplifier) and the airbag issue both score severity 4, so I'll lead with fire since it poses a broader ambient risk.
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The 1992 Acura Legend has 3 recalls, the most serious being a fire risk in vehicles equipped with the Bose audio system, where a transistor in the speaker amplifiers mounted behind the rear seat can overheat and produce smoke or catch fire.
The passenger-side airbag on certain vehicles was assembled without igniter material, meaning the airbag may not deploy at all in a crash, or may deploy too slowly to provide meaningful protection. This leaves the front passenger with significantly reduced restraint protection in a collision.