You need a PST-2 or a trip to the dealer to read the alarm system's event and error logs. It will tell you which one of the many sensors are at fault.
In your case, take it back to the shop and insist they fix it for free.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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