FORD 2010 Mustang v.1 - Manual (Page 208)

If you cannot move the gearshift lever out of P (Park) with ignition in
the on position and the brake pedal depressed:
1. Apply the parking brake.
2. Using a flat head screwdriver,
remove the cap.
3. Press and hold the lever down
while pulling the gearshift lever out
of the P (Park) position and into
the N (Neutral) position.
4. Reinstall the cap.
5. Start the vehicle.
If it is necessary to use the above procedure to move the gearshift lever,
it is possible that a fuse has blown or the vehicle’s brakelamps are not
operating properly. Refer to Fuses and relays in the Roadside
Emergencies chapter.
WARNING: Do not drive your vehicle until you verify that the
brakelamps are working.
WARNING: Always set the parking brake fully and make sure
the gearshift is latched in P (Park). Turn the ignition to the off
position and remove the key whenever you leave your vehicle.
WARNING: If the parking brake is fully released, but the brake
warning lamp remains illuminated, the brakes may not be
working properly. Contact your authorized dealer as soon as possible to
have the system serviced immediately.
2010 05+ Mustang (197)
Owners Guide, 1st Printing
USA (fus)
Driving
208