If the horn beeps once when you lock it, that means that one of the sensors is detecting that something is not latched properly. It could be a door, the frunk, the trunk, or even the center console.
Finding the offending sensor and fixing it can be time consuming.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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