FlyerTalk Forums - Ford MyKey Deactivation

It is a safety feature of new Ford models to be programmed with a max speed of 80 MPH and max volume of 40%. This is is possibly implemented by the factory or previous renters.

Without the admin key, you can not deactivate this (the spare key in the spare ire in the trunk may be the admin key, however).
Only the station manager has the ability to remove the MyKey restriction.
To see if MyKey is enabled, turn on the ignition and it will display "MyKey Active" within approximately 5 seconds
When you enable the system, the key you are using becomes the MyKey and the other key becomes the AdminKey.
Every feature of MyKey can be customized to your specific needs. The speed limit, however, is set by the factory at 80 MPH (130 km/h) and cannot be customized. Here are the MyKey features and your options:

Speed Limit 80 MPH (130 km/h)
On
Off

Speed Warning Chime (Approaching Top Speed)
Chime at 55 MPH (90 km/h)
Chime at 65 MPH (105 km/h)
Chime at 75 MPH (120 km/h)
Off

Volume Limit
40%
Off

ESP System Cannot be Disabled
On
Off