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Disconnecting Battery 1989 Carrera

Electrical and Electronic

Vehicle Information: Model: 911 Carrera; Year: 1989; Body Type: Coupe; Engine (type, size, modifications): 3.2 liter; Total Mileage: 3050;

I want to remove the battery in my 1989 911 Carrera to clean and inspect. Will disconnecting the battery screw up the "brain"? I know some cars have to reprogrammed with any interruption of the power supply.

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