Do it yourself, remove or replace the ignition coils on your Ford Focus, made between the years 1999 and 2007. For this particular repair, you will require four new ignition coils from your local auto parts shop, an 8 mm socket wrench and in some cases (depending on the coils you buy) it is better to have some dielectric grease, to apply on the new coils. The repair process is very easy and it will take you about 10 minutes.
First of all, open the hood of your car and disconnect the negative cable of the battery. It is better that way, because working with the coils might sometimes produce electrical problems. You can avoid this type of problems in this way. You can then go above the engine and locate the four ignition coils, shown in the next picture.
At this moment, you should remove the four 8 mm bolts that hold the coils using the socket wrench. After you do it, pull up the coils and then unplug their electrical harnesses. You can do it using your fingers or using a flat blade screwdriver, if you find it easier. We marked the bolts and the harnesses with blue arrows in the image below.
Now, you can install the new ignition coils. Use compatible coils only, as replacements. Before installing the new coils, you can use some dielectric grease, placed just inside their tips, if they do not have it pre applied. Install back all the coils, connect their harnesses and tighten the bolts that hold them. Reconnect the negative cable on the battery and this is it. These are the steps you need to follow if you need to remove or replace the ignition coils on Ford Focus, manufactured between the years 1999 and 2007.