2010 Ford Mustang Owner's Manual - Page 203

Driving BRAKE-SHIFT INTERLOCK This vehicle is equipped with a brake-shift interlock feature that prevents the gearshift lever from being moved from P (Park) when the ignition is in the on position unless the brake pedal is pressed. If you cannot move the gearshift lever out of P (Park) with ignition in the on position and the brake pedal pressed: 1. Apply the parking brake. 2. Using a flat head screwdriver or similar tool, remove the cap. 3. Locate the access hole at the front of the area under the cover. 4. Insert the screwdriver or similar tool into the hole and press and hold the lever forward while pulling the gearshift lever out of the P (Park) position and into the N (Neutral) position. 5. Reinstall the cap. 6. 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 brake lamps 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. 203