🔧 Focus - Ignition Coil Replacement

Your Focus uses a coil-on-plug system, meaning each spark plug has its own ignition coil sitting right on top of it. Replacing a bad coil is usually straightforward: unplug it, remove one small bolt, and swap it out.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

Assumption: 2.0L Ti-VCT coil-on-plug layout (most common).

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely; coils sit on a hot valve cover.
• ⚠️ Keep the key out of the ignition while working.
• ⚠️ Disconnecting the negative battery cable is recommended to prevent accidental shorting.
• ⚠️ Pull on connectors by the plug body, not the wires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3" extension (1/4" drive)
• 8mm socket
• Torque wrench (in-lb)
• Small flathead screwdriver
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and open the hood.
• Let the engine cool so you don’t tear rubber boots on a hot engine.
• Use a 10mm socket to disconnect the negative battery terminal and move it aside so it can’t spring back.
• Do one coil at a time to avoid mix-ups.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use your hands to pull upward firmly at the corners to pop the cover off (most covers are held by rubber grommets).
• If your cover uses fasteners, remove them with the appropriate socket (commonly 8mm socket).
• Set the cover aside where it won’t get stepped on.

Step 2: Locate the ignition coils

• Look on top of the engine: you’ll see 4 identical coils in a row.
• Each coil has an electrical connector and one small hold-down bolt.

Step 3: Unplug the coil electrical connector

• Use a small flathead screwdriver to gently help lift the locking tab if it’s stubborn.
• Pull the connector straight off the coil.
• Don’t pry hard—plastic tabs break easily.

Step 4: Remove the coil hold-down bolt

• Use an 8mm socket with a 1/4" drive ratchet and 3" extension to remove the bolt.
• Put the bolt somewhere safe (dropping it can turn into a long search).

Step 5: Remove the ignition coil

• Grip the coil and twist it slightly left and right to break the seal.
• Pull straight up to remove it from the spark plug well.
• If it feels stuck, keep twisting—don’t use brute force.

Step 6: Prep and install the new coil

• Put a pea-sized amount of dielectric grease inside the new coil boot (the rubber end). Dielectric grease is a non-conductive grease that helps prevent moisture and makes future removal easier.
• Line the coil up with the spark plug tube and push straight down until it seats fully.
• Reinstall the hold-down bolt using the 8mm socket.
• Torque to 44 in-lb (5 Nm) using a torque wrench (in-lb).

Step 7: Reconnect the electrical connector

• Push the connector on until it clicks/locks.
• Give it a gentle tug to confirm it’s latched.

Step 8: Repeat for any other coils being replaced

• Replace additional coils one-by-one using the same steps.
• Matching “one out at a time” prevents mistakes.

Step 9: Reinstall the engine cover and reconnect the battery

• Reinstall the engine cover by pressing it back into its grommets (or reinstall fasteners with the 8mm socket if applicable).
• Reconnect the negative battery terminal using the 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds. It should run smooth.
• If the check engine light was on due to a misfire, it may take a few drive cycles to turn off; a scan tool can clear it immediately.
• Take a short test drive and recheck that all coil connectors are fully seated.
• If you still feel a misfire, the next common step is inspecting/replacing spark plugs.

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💰 DIY vs Shop Cost

Shop Cost: $180-$500 (parts + labor)

DIY Cost: $40-$320 (parts only)

You Save: $140-$180 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 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.