MyKey Speed Restrictor
 

Playing around with MyKey in an attempt to play a prank on my brother when I let him drive car... will only be 2nd person besides me to drive it since I bought it :P And I was looking at my Key and saw I can set maximum speed limit at 80 mph but has <80MPH> like this like it can be changed to higher or lower setting but I couldn't figure out how to make it move... and only thing I found in owners manual was about the chimes set at different speeds... Does our car have a valet mode with the limiter so we can set it down to say 45ish?

That's funny, punishermustang!

Here are the steps found in your Owner's Manual (3rd Printing):

Programming MyKey_ Optional Settings
Turn the ignition on using an admin key. To program the optional
settings, use the message center buttons to do the following:
1. Press SETUP until RESET FOR MYKEY SETTINGS is displayed.
2. Press and release the RESET button to display MyKey setup menus.
The first menu shown is:
MYKEY MAX MPH <80 MPH> OFF
3. If you don’t want to change the maximum speed setting, press the
SETUP button to display the next menu. The remaining menus appear as
follows with the default settings shown:
MYKEY MPH TONES 45 55 65 <OFF>
MYKEY VOLUME LIMIT <ON> OFF
MYKEY ADVTRAC CTRL ON <OFF>.
4. On any of the menus press RESET to highlight your choice with the
<…>.
5. Press SETUP to enter your choice. The next optional setting will be
displayed.
6. Repeat Steps 4 and 5 until you are done changing the optional
settings.

Deysha