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underneath the battery
According to the 2011 Ford Fusion Owner Guide : It has the Motorcraft BXT-96R-500 battery with all engine sizes ( BCI group size 96R )
battery cable connection , dead battery
The hood should still open when the battery is dead
Does it not have a key lock by the front door handle ( that's what I did on my 1995 Ford Explorer XLT when the battery was dead )
Poor cable connections to the battery , or dead battery
Reset the check engine light on a Ford Fusion by disconnecting the battery. On newer cars, once the battery is reconnected, the light will come back on. If this happens, disconnect the battery, turn on the headlights until they go off, draining all the electrical current from the capacitor. Reconnect the battery and the light will go off.
bad battery cable connection , dead battery
Defective alternator, dead cell in battery, or something is on pulling power from the battery.
battery is dead
Remove the negative terminal first and connect it back last.
Near the battery, small red handle.