If the airbag warning light illuminates, it must be attended to quickly. Seat belt buckles, wiring updates/repairs, and/or airbag module faults may be the cause.Google+
Car Problem Reports
Porsche Boxster Airbag Warning Light Due to Seat Belt Buckles, Wiring, or Module Faults
Porsche Boxster Problem
Average Mileage: 75,712 mi (46,600 mi - 92,000 mi)
Visitor, 2007 Porsche Boxster, 46,600 mi
airbag light came on, fault listed in center console warning area.
Visitor, 1998 Porsche Boxster, 92,000 mi
AIR BAG LIGHT CAME ON. REPLACED SEAT BELT. NOW SERVICE SAYS I NEED WHOLE NEW WIRING HARNESS AND AIR BAG FOR PASSENGER SIDE.AND
airbag warning light was on. the detailed labor on receipt reads, - scan for faults on airbag light =, checked drivers seatbelt buckle is shorted, removed and replaced with new, found wiring update has been done under seat however connectors are not secured, also found buckle connections, removed both seats and performed repair on wiring, harness is now properly mounted under both seats and has proper ground.
after this I went back 3x from the initial repair to my mechanic until the problem got fixed.it kept coming on and off. now it's fixed.