---
title: 1998 - 2008 Ford, Mercury Vehicle Key Programming Instructions (Select Models)
description: "Instructions for Models: 1999-2004 Ford F-150/F-250 Light Duty, 1999-2000 Ford Contour, 1998 & 2004 Ford Crown Victoria, 1999-2008 Ford Explorer, 1999 Mercury Mystique, 1998-1999 Mercury Sable"
---

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# 1998 - 2008 Ford, Mercury Vehicle Key Programming Instructions (Select Models)

## Instructions for Models: 1999-2004 Ford F-150/F-250 Light Duty, 1999-2000 Ford Contour, 1998 & 2004 Ford Crown Victoria, 1999-2008 Ford Explorer, 1999 Mercury Mystique, 1998-1999 Mercury Sable

NOTE: You cannot program keys to your vehicle unless you have two working keys on hand. If you have one or no current keys, you must go to a locksmith or a dealer to program the key(s) to your vehicle. The key(s) will need to be cut by a professional before programming can occur.

1. Insert an existing working key into the ignition cylinder.
2. Turn the ignition cylinder to on (run) and back to off.
3. Remove the existing working key and, within five seconds, insert a second working key and turn it to the on position (run) then back off.
4. Remove the second working key and insert the new key before ten seconds have elapsed and turn it to the on position (run).
5. Leave it on for one second and turn it back off.
6. The security light will light up for three seconds to indicate that the new key has been successfully programmed.

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