🔧 Accord - Ignition Coil Replacement

Your Accord uses “coil-on-plug” ignition coils—one coil sits directly on top of each spark plug. Replacing weak or failed coils can fix misfires, rough idle, and flashing check-engine lights by restoring strong spark to each cylinder.

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

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⚠️ Safety & Precautions

• 🛑 Let the engine cool fully before starting (hot parts burn skin).
• 🧤 Keep the key out of the ignition so the engine can’t be started accidentally.
• 🔋 Battery disconnect is recommended: remove the negative terminal first to prevent accidental shorts.
• ⚡ If the check-engine light is flashing, avoid driving until repaired (can damage the catalytic converter).

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 6" socket extension (1/4")
• Torque wrench (in-lb or small ft-lb range)
• Flathead screwdriver
• Trim clip tool
• Needle-nose pliers
• Shop towels
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Replace all four - Qty: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, put the shifter in neutral, and set the parking brake.
• Open the hood and remove any loose items around the engine bay.
• Disconnect the battery: use a 10mm socket to remove the negative terminal first, then tuck it aside so it can’t spring back.
• Blow/brush away dirt around the coils so debris can’t fall into the spark plug wells. Cleanliness prevents future misfires.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• If your Accord has a plastic engine cover, remove its fasteners using a 10mm socket or release clips with a trim clip tool.
• Lift the cover off and set it aside.

Step 2: Locate the ignition coils

• The coils are the 4 identical units on top of the valve cover, each with an electrical connector and a single hold-down bolt.
• Wipe the area with shop towels so you don’t push grit into the holes.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight off the coil.
• If it’s stuck, gently help the tab with a flathead screwdriver while pulling—don’t pry hard on the wires.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket with a 6" socket extension (1/4") and 1/4" ratchet to remove the bolt.
• Set the bolt somewhere safe so it can’t fall into the engine bay.

Step 5: Pull the coil out

• Grip the coil and twist it slightly left-right to break the seal, then pull it straight up and out.
• If it won’t budge, use gentle rocking—don’t use tools to pry against the valve cover.

Step 6: Prep and install the new coil

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

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, then finish with a torque wrench.
• Torque to 12 Nm (9 ft-lbs)

Step 8: Reconnect the electrical connector

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

Step 9: Repeat for the remaining coils

• Do the same steps for the other 3 coils, one at a time.
• One-at-a-time prevents mixing connectors.

Step 10: Reinstall engine cover and reconnect the battery

• Reinstall the engine cover using the 10mm socket or clips with the trim clip tool.
• Reconnect the battery negative terminal using a 10mm socket and tighten snugly.

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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; best practice is to clear codes with a scan tool (if available).
• Test drive for 10-15 minutes and verify no hesitation under acceleration.
• Recheck that all connectors are fully clicked in if you still feel a misfire.

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💰 DIY vs Shop Cost

Shop Cost: $250-$550 (parts + labor)

DIY Cost: $120-$320 (parts only)

You Save: $130-$230 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.