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To reset the security system on a 2003 Mercury Mountaineer, first ensure that the vehicle is in the "Off" position. Disconnect the negative battery terminal and wait for about 10-15 minutes to allow the system to reset. Reconnect the battery terminal, then attempt to start the vehicle. If the issue persists, it may be necessary to consult the owner's manual or a professional for further troubleshooting.

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4mo ago

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