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1991 964 Key will not lock doors

Electrical and Electronic

Vehicle Information: Model: 964; Year: 1991; Body Type: Cabriolet; Total Mileage: 70000;

All of a sudden I can not use the key to lock the doors. If the doors are already locked, the key will unlock them. If inside the car, I can use the central locking button to lock and unlock the doors. The only difference between when they worked and when they did not, is that I replaced the battery.Any ideas as to what/where to look?

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