🔧 Focus - Spark Plug Replacement

Replacing the spark plugs on your Focus restores strong ignition, smooth idle, and good fuel economy. On the 2.0L, the plugs sit under the ignition coils (coil-on-plug: one coil directly on each plug), so you’ll remove coils first, then the plugs.

Difficulty Level: Beginner | Estimated Time: 0.8-1.5 hours

---

⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns and damaged threads.
• ⚠️ Keep dirt out of the spark plug holes; debris can damage the engine.
• ⚠️ Do not over-tighten spark plugs; the cylinder head is aluminum.
• ⚠️ Battery disconnect is not required, but keep the key OFF and don’t unplug coils with the engine running.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 1/4" drive ratchet
• 3/8" drive ratchet
• 8mm socket
• 3/8" drive torque wrench (5-30 ft-lbs range)
• 5/8" spark plug socket
• 3/8" drive extension (6")
• Compressed air blow gun
• Feeler gauge set
• Small flat trim tool

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (OEM-equivalent for 2.0L) - Qty: 4
• Dielectric grease - Qty: 1 (small packet/tube)

---

📋 Before You Begin

• Park on level ground, engine OFF, and let the engine cool completely.
• Open the hood and remove any loose items around the engine cover.
• Take a quick photo before unplugging anything.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a small flat trim tool to gently lift the cover corners if it’s tight.
• If your cover uses bolts, remove them with an 8mm socket and 1/4" drive ratchet, then lift the cover off.

Step 2: Unplug and remove the ignition coils

• One at a time, unplug each coil electrical connector. Use the small flat trim tool only if the lock tab is stubborn.
• Remove the coil hold-down bolt with an 8mm socket and 1/4" drive ratchet.
• Pull the coil straight up and out. Twist gently to break it free.

Step 3: Clean around the spark plug wells

• Blow out dirt from each spark plug hole using compressed air blow gun.
• This prevents grit from falling into the cylinder when the plug comes out.

Step 4: Remove the old spark plugs

• Install the 5/8" spark plug socket on a 3/8" drive extension (6") and 3/8" drive ratchet.
• Turn counterclockwise to loosen, then remove the plug the rest of the way by hand (still using the socket).
• Repeat for all 4 cylinders.

Step 5: Check and prep the new spark plugs

• Use a feeler gauge set (thin measuring blades) to verify the plug gap matches the plug manufacturer spec for your engine. Don’t force the gauge.
• Do not apply anti-seize unless your plug manufacturer specifically requires it; most modern plugs have plated threads.

Step 6: Install the new spark plugs and torque them

• Start each plug by hand using the 5/8" spark plug socket and 3/8" drive extension (6") only (no ratchet at first).
• Once finger-tight, torque each plug using a 3/8" drive torque wrench (5-30 ft-lbs range).
• Torque to 15 Nm (11 ft-lbs).

Step 7: Reinstall the ignition coils

• Put a tiny smear of dielectric grease inside each coil boot (dielectric grease is a non-conductive grease that helps prevent moisture and boot sticking).
• Push each coil straight down until fully seated on the plug.
• Install the coil bolt using an 8mm socket and 1/4" drive ratchet (snug only; small bolts strip easily).
• Reconnect each electrical connector until it clicks.

Step 8: Reinstall the engine cover

• Reinstall the cover and any bolts using an 8mm socket and 1/4" drive ratchet.

---

✅ After Repair

• Start the engine and let it idle for 30-60 seconds. It should run smooth with no shaking.
• If the check engine light comes on or it runs rough, shut it off and re-check that every coil connector is fully clicked in.
• Take a short test drive, then re-check for any fuel/engine smell or unusual noises (there shouldn’t be any).

---

💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $25-$80 (parts only)

You Save: $100-$300 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.2 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.