🔧 Focus - Ignition Coil Replacement

The ignition coils sit on top of the spark plugs and create the high voltage needed to fire the plugs. Replacing a bad coil can fix misfires, rough idle, poor power, and flashing check engine light.

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

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool before you start; the valve cover area gets very hot.
• ⚠️ Keep the key out of the ignition while unplugging coils.
• ⚠️ If you disconnect the battery, use a 10mm socket and remove the negative terminal first.
• ⚠️ Pull coils straight up; don’t pry hard on plastic connectors.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• Torque wrench (inch-pound capable)
• Small flat trim tool
• 10mm socket
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 4 if replacing all)
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and open the hood.
• If your check engine light was flashing (active misfire), avoid driving until repaired.
• Replace 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)

• Grip the cover and pull upward to pop it off the rubber grommets.
• If it feels stuck, use a small flat trim tool to gently lift at a corner, then pull up.

Step 2: Locate the ignition coils

• The coils are the 4 identical units on top of the valve cover, each with an electrical connector.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight off.
• If the tab is stubborn, use a small flat trim tool to gently help lift the lock while pulling.

Step 4: Remove the coil retaining bolt

• Use an 8mm socket, 1/4" drive ratchet, and 6" extension to remove the bolt holding the coil down.
• Set the bolt somewhere safe (it’s easy to drop).

Step 5: Remove the ignition coil

• Pull the coil straight up while gently twisting by hand.
• If it’s stuck, keep twisting and pulling—avoid prying hard on the valve cover.

Step 6: Install the new ignition coil

• Put a very small smear of dielectric grease inside the coil boot (the rubber end that goes over the spark plug).
• Push the new coil straight down until it fully seats on the spark plug.

Step 7: Reinstall and torque the coil bolt

• Start the bolt by hand to avoid cross-threading.
• Use an 8mm socket to snug it down.
• Use a torque wrench (inch-pound capable): Torque to 7 Nm (62 in-lbs).

Step 8: Reconnect the electrical connector

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

Step 9: Repeat for other coils (only if replacing more than one)

• Repeat Steps 3–8 for each additional coil you’re replacing.

Step 10: Reinstall the engine cover

• Align the cover with the grommets and press down firmly at each corner until it pops into place.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth with no shaking.
• If you had a check engine light, it may take a few drive cycles to turn off, or you can clear codes with a scan tool.
• Test drive gently, then recheck that all connectors are fully seated.
• If it still misfires, the next common items are spark plugs and coil connectors/wiring.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor)

DIY Cost: $35-$280 (parts only, depending on 1 coil vs 4)

You Save: $145-$170+ 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.