Introduction
You may have a 2013 GMC Terrain, and your headlight bulb is out. Don't think about taking it to a mechanic because you can do it yourself with just one tool. All you'll need is your new H11 headlight bulb and a T15 Torx screwdriver.
Tools
Parts
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Turn the wheels toward the opposite side of the broken headlight.
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Go to the Front fender, which is on the same side as the broken headlight, to find the cover in the inner fender.
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Use a T15 Torx screwdriver to remove the screw.
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Turn the cover counterclockwise to remove it.
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Reach your hand into the hole to find the round cap to the bulb.
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Turn it counterclockwise to expose the socket holding the bulb.
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Place the inner fender cover over the hole.
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Twist the cover clockwise until it's tight
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Screw in the Torx screw until it is tight.
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Now your headlights should work perfectly.