From behind.
How do you remove the brake light cover on a ford focus
Sedan or hatch makes a difference
look under the hood behind the light,There is a clip that holds the bulb in
the box containing all the bulbs is in the boot,one at each side,pull out old bulb and replace.
To change the brake light on a 2008 Ford Focus, start by opening the trunk and removing the plastic cover or panel that protects the rear light assembly. Next, locate the brake light bulb socket, twist it counterclockwise to remove it, and then pull out the old bulb. Insert the new bulb into the socket, reassemble the components, and test the brake light to ensure it's working properly.
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See sources and related links below to look at the complete light bulb list for 2007 Ford Focus.
change it from the inside
For illustrated answer go to http://www.focusfanatics.com/howtos/rearlight/
I'll make this easy for you... 1) Remove old bulb 2) Instert new bulb 3) ?????????? 4) Profit!!
ho change the head light bulb in a 2000 ford f- 150
You change them from the INSIDE.