---
title: 2004-2007 Mercury Monterey Key Programming Instructions
description: "NOTE: If you do not have two working keys, you won't be able to program this key yourself. You will need to get the key(s) programmed by a qualified automotive locksmith or dealer before you can program a third yourself."
---

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# 2004-2007 Mercury Monterey Key Programming Instructions

## NOTE: If you do not have two working keys, you won't be able to program this key yourself. You will need to get the key(s) programmed by a qualified automotive locksmith or dealer before you can program a third yourself.

 

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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