Horn keeps going off even when car is not locked; first started yesterday on way home when I stepped on the brakes?!
Common 1999 911 problem Stephanie that needs to be repaired by a qualified Porsche mech. He will need to remove face of your steering wheel and replace horn switch that has worn out and is loose inside steering wheel. Will only get worse and could cause you issues when you hit your brakes behind car(s) stopped for red light. Trust me - I almost got in a couple of fights as they thought I was being a wise guy & "playing Porsche games".
Lew Andersen
SOURCE: 1999 porsche boxster cannot lock car with key or
Try replacing the battery in the key. It may be too weak to engage lock.
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