🔧 Accord - Ignition Coil Replacement

Your Accord uses one ignition coil per cylinder (coil-on-plug). Replacing a bad coil can fix misfires, rough idle, flashing check-engine light, and loss of power.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; coils sit on a hot cylinder head.
• ⚠️ Turn ignition OFF and keep the key away from the car while working.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Pull on connectors by the plastic housing, 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" socket extension (1/4")
• Torque wrench, 3/8" drive (10–30 ft-lbs range)
• 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: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to neutral, and set the parking brake.
• Open the hood and let the engine cool fully.
• Use a 10mm socket to disconnect the negative battery cable and move it aside so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use a 10mm socket and 1/4" drive ratchet to remove the engine cover nuts/bolts (if equipped).
• Lift the cover straight up and set it aside.

Step 2: Locate the ignition coils

• The coils are on top of the engine, lined up in a row—one per cylinder.
• Each coil has an electrical connector and a single small hold-down bolt.

Step 3: Unplug the coil electrical connector

• Use a small flathead screwdriver to gently help lift the lock tab if it’s stubborn.
• Pull the connector straight off by the plastic housing.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 6" extension, and 1/4" drive ratchet to remove the bolt.

Step 5: Remove the ignition coil

• Grip the coil and twist slightly left-right to break the seal, then pull straight up.
• Don’t pry hard on the valve cover.

Step 6: Prep and install the new coil

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

Step 7: Reinstall and torque the coil bolt

• Start the bolt by hand to avoid cross-threading.
• Use a torque wrench (a tool that tightens to an exact setting) and 10mm socket to tighten the coil bolt: Torque to 12 Nm (9 ft-lbs).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks/locks.

Step 9: Repeat for the remaining coils

• Repeat Steps 3–8 for each cylinder.
• Replace coils as a set for best reliability.

Step 10: Reinstall the engine cover and reconnect the battery

• Reinstall the cover using the 10mm socket and 1/4" drive ratchet.
• Reconnect the negative battery cable using the 10mm socket.

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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 flashing before, confirm it stays off now.
• Take a short test drive and verify there’s no hesitation under acceleration.
• If the check-engine light remains on, the code may need to be cleared with a scan tool, or there may be another issue (spark plugs, injector, vacuum leak).

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💰 DIY vs Shop Cost

Shop Cost: $300-$650 (parts + labor)

DIY Cost: $140-$400 (parts only)

You Save: $160-$250 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?

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