If your Denso sat nav stereo in the Ford Mondeo is not working while the function buttons are responsive, it may be due to a blown fuse, a loose connection, or a software issue. First, check the vehicle's fuse box for any blown fuses related to the stereo system. If the fuses are fine, try disconnecting and reconnecting the stereo to reset it. If the problem persists, consider seeking help from a professional technician or the dealership for further diagnostics.
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