How to Replace Spark Plugs on 2005 Ford Focus 2.0

The 2005 Ford Focus 2.0 uses spark plugs that should last for 30,000 to 60,000 miles. Eventually, fuel economy will decrease, and general engine performance will decrease as the plugs wear out. When this happens, you'll need to replace the spark plugs. If you don't, and your plugs deteriorate significantly, your engine will misfire. If left unchecked, this causes premature engine wear. Replacement spark plugs can be purchased from any auto-parts store.

Things You'll Need

• Spark plugs
• Socket wrench
• Socket extension
• Spark-plug socket

Instructions

1. Open the hood and grab a spark-plug wire by the boot and pull it off of the top of the engine. You might need to juggle it back and forth a bit before it will come out of the top of the engine.

2. Attach the socket extension to the spark-plug socket and lower it down into the plug well. Then, unbolt the spark plug using a socket wrench.

3. Pull the spark plug out of the plug well and insert a new spark plug. Installation is the reverse of removal. Be careful when threading the new spark plug. Spark plugs cross-thread very easily. Once you have started the first few threads without the assistance of the socket wrench (turning the socket extension and socket by hand), you can tighten the plug down fully with a socket wrench. The spark plug should thread very easily.

4. Replace the spark-plug wire.

5. Repeat steps 1 through 4 for each spark plug.

References

• "Ford Focus Repair & Service Manual 2000-2007"; Jay Storer, John H. Haynes; 2009