🔧 Accord - Ignition Coil Replacement

Your Accord’s ignition coils create the high-voltage spark that fires each cylinder. If a coil is weak or failed, you’ll usually get a misfire, rough running, or a flashing check-engine light. This job is straightforward and sits right on top of the engine.

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

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully; coils sit near hot metal parts.
• ⚠️ Keep the key fob away and ignition OFF while unplugging coils.
• ⚠️ If the check-engine light is flashing, avoid driving; it can damage the catalytic converter.
• ⚠️ Battery disconnect is optional, but safer if you’re nervous around connectors.

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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" drive)
• Torque wrench (inch-pound or small Nm range)
• Flat trim tool
• Needle-nose pliers
• Shop light
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

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

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool.
• If disconnecting the battery: use a 10mm socket to remove the negative terminal and tuck it aside so it can’t spring back.
• Take a quick photo of coil connectors first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the ignition coils

• Locate the coils on top of the engine (one per cylinder, lined up in a row).
• If your Accord has a plastic engine cover, remove it using a 10mm socket (or release clips with a flat trim tool) and lift it off.

Step 2: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight off the coil.
• If it’s stubborn, use a flat trim tool gently to help the tab—don’t pull on the wires.

Step 3: Remove the coil hold-down bolt

• Use a 10mm socket, 6" extension, and 1/4" ratchet to remove the bolt holding the coil down.
• Set the bolt aside where it won’t fall into the engine bay.

Step 4: Remove the ignition coil

• Twist the coil slightly, then pull straight up to remove it from the spark plug tube.
• Pull straight up to avoid tearing the boot.

Step 5: Prep and install the new coil

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

Step 6: Reinstall the hold-down bolt and torque it

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

Step 7: Reconnect the electrical connector

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

Step 8: Repeat for any other coils (if replacing more than one)

• Repeat Steps 2–7 for each additional coil.
• Do one coil at a time to avoid mix-ups.

Step 9: Reinstall the engine cover and reconnect battery (if disconnected)

• Reinstall the engine cover using a 10mm socket or snap the clips back in place.
• If you disconnected the battery, reconnect the negative terminal using a 10mm socket and tighten securely.

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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 stay on until cleared with a scan tool or after some drive cycles (if the problem is fixed).
• Test drive 10–15 minutes. Watch for hesitation, shaking, or a flashing check-engine light.
• If it still misfires, the next common item is spark plugs or a wiring/connector issue at that cylinder.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor, depending on how many coils)

DIY Cost: $45-$320 (parts only)

You Save: $135-$130 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.