My 2000 Ford Focus SE recently developed this problem, where I'm driving on the highway when suddenly the speedometer drops to zero while simultaneously the radio volume goes really low. Normally it lasts for a few seconds, then the speedometer just as suddenly reverts to normal, as does the radio. I looked around and found that this problem is often related to the speed sensor. I had that checked by the dealer, as well as the wiring to the instrument cluster and radio, and they can't find the source of the problem. What else could it be?
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2000 Ford Focus: speedometer goes to zero and radio goes out?
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it has ground problem mine did