🔧 Civic - Ignition Coil Replacement

Your Civic uses one ignition coil per cylinder (4 total). A bad coil can cause a misfire, rough idle, flashing check-engine light, and loss of power. Replacing a coil is straightforward and usually doesn’t require removing major parts.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep the key out of the ignition so the engine can’t be started accidentally.
• ⚠️ If the check-engine light is flashing, avoid driving hard—misfires can damage the catalytic converter.
• ⚠️ Battery disconnect is recommended if you’re nervous around electrical connectors.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3" socket extension
• Torque wrench (in-lb or low-range ft-lb)
• Flathead screwdriver
• 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 Replace all four if high mileage
• Dielectric grease - Qty: 1

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📋 Before You Begin

• 🅿️ Park on level ground, transmission in neutral, and set the parking brake.
• 🔑 Turn ignition OFF and remove the key.
• 🔋 Optional (recommended): disconnect the negative battery cable using a 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Remove any cover fasteners by hand; if a bolt is present, remove it with a 10mm socket and 1/4" drive ratchet.
• Lift the cover straight up and set it aside.

Step 2: Locate the ignition coils

• The coils sit on top of the engine valve cover in a row—one per cylinder.
• Each coil has an electrical connector and one small hold-down bolt.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight back.
• If it’s stuck, gently help the tab with a flathead screwdriver (don’t pry hard).

Step 4: Remove the coil hold-down bolt

• Remove the bolt using a 10mm socket, 3" socket extension, and 1/4" drive ratchet.
• Set the bolt somewhere safe so it doesn’t fall into the engine bay.

Step 5: Pull the ignition coil out

• Twist the coil slightly left-right, then pull straight up to remove it.
• Wiggle gently; don’t force it.

Step 6: Install the new ignition coil

• Apply a tiny smear of dielectric grease inside the rubber boot (this helps prevent moisture and makes future removal easier).
• Push the new coil straight down until it fully seats on the spark plug.

Step 7: Reinstall the hold-down bolt and torque it

• Start the bolt by hand a few turns to avoid cross-threading.
• Tighten with a 10mm socket and 1/4" drive ratchet, then torque with a torque wrench.
• Torque to 12 N·m (9 ft-lbs).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks.

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

• Do one coil at a time so you don’t mix anything up.

Step 10: Reinstall engine cover and reconnect battery (if disconnected)

• Reinstall the engine cover and tighten any fasteners using a 10mm socket if needed.
• Reconnect the negative battery cable using a 10mm socket.

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✅ After Repair

• 🔎 Start the engine and let it idle for 1-2 minutes. It should run smooth.
• 🚗 Take a short test drive and verify no hesitation or flashing check-engine light.
• 🧰 If the check-engine light stays on, you may need to clear the stored misfire code with a scan tool (or it may clear on its own after a few good drive cycles).

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💰 DIY vs Shop Cost

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

DIY Cost: $40-$260 (parts only)

You Save: $140-$190 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.