Ford MKZ 2010 Owner's Manual page 61

Lights
4. Rotate the headlamp bulb
counterclockwise and remove the
headlamp bulb.
5. Disconnect the electrical connector.
Replacing HID headlamp bulbs (if equipped)
The low beam headlamps on your vehicle use a "high intensity discharge"
source. These lamps operate at a high voltage. When the bulb is burned
out, the bulb and starter capsule assembly must be replaced by your
authorized dealer.
61
2010 MKZ (378)
Owners Guide, 3rd Printing
USA (fus)