2003 ford taurus security flashes theft then it is as if no battey in car(everything is dead radio must be reset when it does start) then it will start perfect .
The security systems pass lock is disabling the vehicle. This usually happens when the ignition switch does not recognize the ignition key and/or a defective fob or the battery in the fob needs to be replaced. If you ignition key is too worn. This could possibly be your problem
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see the dealer on this, u need the security system tested.
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