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Q: Driver Unknown on 1999 Buick Park Avenue

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Shut off the car, got back in started the car up and it would not start. Unknown driver appeared on the dash. What could be the problem?
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If trying your spare key does not work, chances are the fault is with the Passlock sensor. For more information please read the RepairPal article on GM Passlock anti-theft systems, here is the link -
It sounds like a problem with the anti-theft system. The system may not be reading your key correctly. If you have spare key, try it and see how it works.
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