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Old 12-03-2014, 05:19 AM   #14
BoxsterLS376
Registered User
 
Join Date: Oct 2014
Location: Georgia
Posts: 391
check the covertible top drain holes, like the others said it is likely your immobilizer. Even if the floor is not currently wet you should pull the seat and pull out the alarm control unit (immobilizer). Even if the drains are not clogged it does not take much moisture such as leaving the window down for a bit on a rainy day to get enough moisture in there to corrode the connections.

Pull the ecu and clean any corrosion you see, open it and clean inside too with electrical parts cleaner, if it gets worse the alarm control unit will need to be replaced by the dealer. Cost is around $700~ parts/labor, although you may need a new key fob which will also need to be programmed... those can get pricy too~
Good luck
J
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