DIY Cost: $20-$45 Est. Time: 45 min Difficulty: Easy Summary This guide provides instructions on how to replace sparkplugs on a Ford Focus. What you will need Parts Ford focus sparkplugs Tools Small flat-head screwdriver 10 mm socket Ratchet or power tool Sparkplug socket Procedure Put the vehicle in park. Wait for the engine to cool down. Open the hood. Remove ignition coil electrical connectors by using a small screwdriver to unlock the connectors. Loosen and remove 10 mm bolts that hold ignition coils in place. Pull out the ignition coils. Remove the spark plugs using a sparkplug socket. Install and tighten the new sparkplugs using a sparkplug socket. Reinstall the ignition coils. Install and fasten 10mm coil retaining bolts. Reconnect electrical connectors. Torque Specifications Spark plugs: 11 ft/lbs Frequently Asked Questions What is the lifespan of Ford Focus sparkplugs? It is recommended to replace sparkplugs every 100,000 miles. Is it necessary to re-gap the sparkplugs before installation? Most sparkplugs are pre-gapped, however, it is recommended to check the gap against the manufacturer's specification before installation. How to adjust the gap of a sparkplug? You can adjust the gap of a sparkplug by using a feeler gauge and a plier. You have to measure the gap while adjusting it using a plier.