from the manual:
"A double horn sound during locking indicates a defect in the central locking or alarm system. Have the defect remedied at an authorized Porsche stealership."
There are 4 types of central locking, programmable by your local stealership:
Type 1: Doors lock automatically when the ignition is switched on.
Type 2: Doors lock automatically when a speed of 3-6mph is exceeded.
Type 3: Doors lock automatically when the ignition is switched on. If doors are opened with the engine running, they lock again automatically when a speed of 3-6mph is exceeded.
Type 4: The doors do not lock automatically.
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