🔧 Civic - Ignition Coil Replacement

Your Civic’s ignition coils sit on top of the engine and send high voltage to the spark plugs. If a coil is weak or failed, you can get misfires, rough idle, poor acceleration, and a flashing check-engine light.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine so you don’t burn your hands.
• ⚠️ Turn ignition OFF and keep the key away from the car while unplugging coils.
• ⚠️ If the check-engine light is flashing, avoid driving until fixed (can damage the catalytic converter).
• ⚠️ Battery disconnect is recommended: remove the negative terminal to prevent accidental shorting.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4")
• Torque wrench (in-lb or low-range ft-lb)
• Small 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 (or Qty: 4 if replacing all)
• Dielectric silicone 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 fully.
• Disconnect the battery negative terminal: use a 10mm socket to loosen the clamp and tuck the cable aside so it can’t spring back.
• Tip: Replace coils one 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 with both hands and pull straight up to pop it off the rubber grommets.
• If any fasteners are present on your cover, remove them with a 10mm socket.

Step 2: Unplug one ignition coil connector

• Locate the coil on top of the engine (one per cylinder).
• Press the connector lock tab and pull the connector straight back.
• If it’s stuck, gently lift the lock with a small flathead screwdriver (don’t pry hard).

Step 3: Remove the coil hold-down bolt

• Use a 10mm socket with a 1/4" ratchet and 6" extension to remove the single bolt holding the coil.

Step 4: Remove the ignition coil

• Twist the coil slightly, then pull straight up to remove it.
• Tip: Don’t yank the wiring harness.

Step 5: Install the new ignition coil

• Put a small smear of dielectric silicone grease inside the rubber boot (dielectric grease is a non-conductive grease that helps prevent moisture and makes future removal easier).
• Push the new coil straight down until it fully seats on the spark plug.

Step 6: Reinstall and torque the hold-down bolt

• Thread the bolt by hand first to avoid cross-threading.
• Use a torque wrench with a 10mm socket and tighten: Torque to 12 N·m (9 ft-lbs).

Step 7: Reconnect the coil electrical connector

• Push the connector on until it clicks/locks.

Step 8: Repeat for the remaining coils (if replacing more than one)

• Repeat Steps 2–7 for each cylinder you’re replacing.
• Tip: If one failed, many owners replace all four.

Step 9: Reconnect battery and reinstall the engine cover

• Reconnect the negative terminal using a 10mm socket.
• Reinstall the engine cover by aligning it and pushing down firmly.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth.
• If the check-engine light was on, it may take a few drive cycles to clear unless you clear codes with a scan tool.
• If it still misfires, the next common items are spark plugs or a wiring/connector issue.

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💰 DIY vs Shop Cost

Shop Cost: $200-$450 (parts + labor)

DIY Cost: $50-$250 (parts only, depending on 1 coil vs all 4)

You Save: $150-$300 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.