The plastic piece that holds the headlight bulb is broke. Can I replace that piece without buying the whole headlight?

If it's just a bulb replacement open the hood and with one hand push in on the headlight, with the other hand inside, pull up on the white plastic retaining clip. This will release the bulb. Pull it out forward, then replace with new bulb (be careful not to touch the new bulb, oil from the hands can cause bulb to burst.)

If you need to replace the whole headlight assembly I would try buying used for a better price.

I actually just did this a couple days ago, this takes about 20 minutes and a little bit of patience. When you pop your hood you will see a protective piece of plastic over the headlights/radiator, you firstly have to remove the plastic clips holding that piece then pull that piece of plastic off, once done u will see 2 bolts holding each headlight in place, i believe it is a 9/16 socket but if not just find the one that fits, remove the 4 bolts (2 for each headlight) and pull the headlight in an up and outwards manor. if you feel any resistance do not yank look at why it is catching and clear it, then it should just pop out (the headlight and the corner piece and clipped together so dont pull it too far out) then when the bulb is accessible pull the old bulb, put the new bulb in and voila place the headlight back into position, redo the 4 bolts holding the headlights and re-attach the plastic headlight/radiator cover. Enjoy the new lights

The headlight is an assembly and will have to be replaced as such. If the damage isn't too severe, sy just a crack, you may be able to repair it temporarily with a hot glue gun. If you can keep moisture from getting to the halogen bulb, it will work until you can have it replaced. Even though it is a 2010 model, check with the local salvage dealers to see if you can find a used one.

Yes, you can replace just the bulb. It's not a sealed unit. There's one phillips head screw that holds in the corner lamp. Then you'll see the outer screws to remove the headlight. On the hood side, carefully peel the rubber off the teardrop shaped plastic holders. Remove the 10mm bolts and the whole assembly should slide right out. Twist the retaining ring (unplug the bulb first) that holds the bulb in. Pull the bulb out. Don't touch the glass on the new bulb as it's halogen and the oil on your fingers will damage it as the bulb heats up. If you do, clean it with rubbing alcohol.

I don't know if you mean the headlight bulb, or the headlight.

When you open the hood and look at the headlight assembly. At the top between the turn signal there is a black plastic wing nut. Unscrew that wing nut to remove the side marker light. After removing that nut persuade it to slide forward. That's the only thing that locks it in. Untwist the socket to replace the turn signal bulb. Since that is out now...There are two more Wing nuts just like the first one that hold the headlight assembly in place. (The black plastic piece the headlight is mounted to) Remove these two wing nuts and lift up on the whole assembly. Those are the only things that lock it into place. Once you slide it off the studs the wing nuts were on. Unplug the plug from the back of the light (use a flat screwdriver to lift the tab a little). Twist the round plastic ring that holds the bulb in. The bulb should pull out now. Don't touch the new bulb with your fingers as it is a halogen bulb and the oil on your fingers will cause a hot spot on it, causing it to fail SOON. If you happen to touch the glass part of the headlight bulb, clean it with rubbing alcohol. Reverse the steps...go eat dinner.

two clips hold the headlight in place at the top...remove these and the headlamp will move forward enabling you to replace the halogen bulb (9007 at CTC)

With the hood open, you will see a long flat flexible plastic cover running across the front, above the headlights. It is riveted in with plastic rivets. Hold the outer part of the rivet, and pull up the center part. Then remove the whole rivet. Remove the plastic cover. (When you put it back on, insert the outer part in the hole, then press the center part down into each rivet.)
You will see a sidelamp and headlight assembly. Look down between the sidelamp and headlight, there should be a black plastic clip or latch that holds the side lamp to the headlight. (The clip is down a hole, in the bracket holding the headlight to the body). You will probably need a long screw drive to get down in the hole to release the clip. And maybe a flash light to see down the hole. Put just enough pressure to release the latch, it is plastic, and if you press to hard it could break. Once released the side lamp will pop forward a bit. The sidelamp section can be pulled forward. a bit. However, there is a long plastic part on the Sidelamp Section that slides into a metal hole in the Fender. It will break if you try to pry the sidelamp section out sideways.
Next you will see two top-mounted bolts holding the Headlight Assembly in place which can easily be accessed and removed. Removing the bolts will loosen the entire headlight assembly.
Some instruction say you can remove the headlight and side assembly as a unit. Do not do this! If you try to remove the headlight assembly without detaching the sidelamp you could break either of the lights or the connection assembly.
The Bulb Assembly twists out of the back of the Headlight Assembly, and the bulb can then be replaced. Be careful not to touch the bulb with your hands or with any grease.
Many of the parts are plastic and can break, so do this carefully and patiently. It sounds a little complicated, but once you learn how, the whole job only takes about 20 minutes.

Hope helped. (remember rated this).

No, you just remove the radiator grill and the side marker light and the headlight housing bolts and it comes out. Not a real hard job and is Real straight forward. Good luck and have a good day.

i actually just did this a couple days ago, this takes about 20 minutes and a little bit of patience. When you pop your hood you will see a protective piece of plastic over the headlights/radiator, you firstly have to remove the plastic clips holding that piece then pull that piece of plastic off, once done u will see 2 bolts holding each headlight in place, i believe it is a 9/16 socket but if not just find the one that fits, remove the 4 bolts (2 for each headlight) and pull the headlight in an up and outwards manor. if you feel any resistance do not yank look at why it is catching and clear it, then it should just pop out (the headlight and the corner piece and clipped together so dont pull it too far out) then when the bulb is accessible pull the old bulb, put the new bulb in and voila place the headlight back into position, redo the 4 bolts holding the headlights and re-attach the plastic headlight/radiator cover. Enjoy the new lights

Having just purchased a 2002 Ford Focus I found that the passenger side headlight had gone. Stumbled accross this thread and thought "looks like a pain".
Popped to Halfords and picked up a H1 bulb, went home and had a look under the bonnet.
Armed with just a screwdriver I managed to change the bulb within 10 mins. Flicked the headlight cover off using the screwdriver for a bit of leverage. Unpluged the headlight and flicked off the retaining clip. Removed the bulb.
Fitting was even easier - Put bulb in place, clip the retaining clip in place, plug in and replace cover.
Job done within 10 minutes with no prior experience of Fords.
Hope it helps
IMPORTANT!!! The retaining clip does NOT just flick off. Tried that and broke the plastic stop that holds the retainer clip and allows it to apply tension to the bulb! The retainer wire is held in place on the bottom by a screw and clip on the bottom and is locked into a plastic clip on top. To remove the wire, push the wire down and towards the passenger side of the car, it will dislodge and you can then lower it to remove the bulb. Once the bulb has been changed, you want to replace the wire the same way to protect the plastic clip. I don't know what I will do about the plastic clip now, the retaining wire has no tension and I'm afraid the bulb will not remain seated properly. However, knowing what I know now, I agree with the above answer: Done in 10 minutes without prior experience with Fords.
=== Just finished doing this. A small mirror and a flashlight make this job simple. It's very easy to do once you can see the top of the clip.
small mirror and flashlight are essential, look at the way the retaining wire seats before you unclip it. flat side of the bulb houseing sits at the bottom of the access hole. retaining wire clips bottom to top. I had a hard time with seating the new bulb and had to figure out the retaining wire clipped from bottom to top because I didn't look at it before I unclipped it. obviously fords designed this for ease of manufacter with very little regard to the average layman who would do the replacing.