🔧 Accord - Ignition Coil Replacement

Your Accord’s ignition coils sit on top of the engine and send high-voltage spark to each spark plug. Replacing a weak coil can fix misfires, rough idle, blinking check-engine light, and poor acceleration.

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

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before starting; coils sit near hot metal.
• ⚠️ Keep the key out of the ignition; don’t work with the engine running.
• ⚠️ If you disconnect the battery, loosen only the negative terminal first to reduce short-circuit risk.
• ⚠️ Pull on connectors by the plastic body, not the wires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" extension for 1/4" drive ratchet
• Torque wrench (inch-pound or small ft-lb 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: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and open the hood.
• Optional but recommended: disconnect the negative battery cable using a 10mm socket and move it aside so it can’t spring back.
• Work one coil at a time to avoid mixing up connectors.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a 10mm socket and 1/4" drive ratchet to remove the engine cover fasteners.
• Lift the cover off and set it aside.

Step 2: Unplug the ignition coil electrical connector

• Find a coil on top of the engine (there are 4, one per cylinder).
• Press the connector lock tab and pull the connector straight back by hand.
• If the tab is stubborn, use a flat trim tool gently to lift the lock. Don’t pry hard; plastic breaks easily.

Step 3: Remove the coil hold-down bolt

• Use a 10mm socket, 6" extension for 1/4" drive ratchet, and 1/4" drive ratchet to remove the coil’s hold-down bolt.
• Set the bolt somewhere safe (they’re easy to lose).

Step 4: Remove the ignition coil

• Grip the coil body and twist it slightly, then pull straight up to remove it from the spark plug tube.
• If it’s stuck, wiggle while pulling—do not use pliers on the coil body.

Step 5: Install the new ignition coil

• Apply a very thin film of dielectric grease inside the rubber boot (this helps sealing and future removal).
• Push the new coil straight down until it fully seats on the spark plug.
• Reinstall the hold-down bolt by hand first (to prevent cross-threading), then tighten with a 10mm socket.
• Tighten the coil bolt with a torque wrench: Torque to 12 Nm (9 ft-lbs).

Step 6: Reconnect the electrical connector

• Push the connector on until it clicks.
• Lightly tug the connector to confirm it’s locked.

Step 7: Repeat for the remaining coils

• Repeat Steps 2 through 6 for the other 3 coils.
• Use a shop light to double-check every connector is fully seated.

Step 8: Reinstall the engine cover

• Set the cover back in place.
• Use a 10mm socket and 1/4" drive ratchet to tighten the fasteners snugly (do not overtighten into plastic).

Step 9: Reconnect the battery (if disconnected)

• Reinstall the negative battery cable using a 10mm socket and tighten it 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 the check-engine light was on, it may take a few drive cycles to go off, or you can clear codes with a scan tool.
• Test drive for 10 minutes and re-check that the engine cover and all connectors are secure.
• If you still have a misfire, the next common cause is spark plugs (worn or incorrect gap).

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💰 DIY vs Shop Cost

Shop Cost: $250-$650 (parts + labor)

DIY Cost: $120-$420 (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.