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I have a 98 Boxster with a child seat installed and I had the exact same problem. The normal response when the child seat is belted in, is for the airbag light to flash for awhile and then go back out as you stated. Initially when I attached the child seat, the airbag light flashed and went out but somewhere along on a drive the airbag light would come on and stay on. I went to dealer to check what caused the fault and in my case, the driver side belt buckle triggered the airbag fault. The dealer cleared the alarm and the fault kept returning caused by the driver side buckle. The belt buckle was replaced the problem went away. The belt buckle is about $80. In my case, the dealer got a little sloppy when they wired up the deactivation bar and I argued that since the Boxster wiring is a little on the flaky side, they should have been a little neater on the deactivation bar install. The dealer agreed and waved the labor charge (1hr - $100) for the belt buckle. So far, the fix has worked (~2 months.) I still watch it carefully because there is a TSB for fixing false airbag alarms that requires replacing tin connectors with gold plated connectors as well as the belt buckles and it's rather pricy for the dealer to do it - ~$560.00. In the early days, it was covered by warranty but no longer unless you find a dealer with a big heart.
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