[LightAges]

The little black block is a capacitor. The wire that is broken is the ground side. The other wire goes to the positive feed on the ignition coils. The broken capacitor will cause a bit more electrical noise and possibly a little erratic spark. It is not too important but you should get a replacement. I don't have any idea what Ford will want for it and you can most certainly find one at a wreckers if they have a Duratec Focus. I do not know what the value of the capacitor is. If you have problems getting one or the price is in excess of $15, then I will measure mine and advise how to replace it with a substitute part for around $5 probably.