🔧 Accord - Ignition Coil Replacement

Your Accord uses “coil-on-plug” ignition coils (one coil per spark plug). Replacing them restores strong spark and can fix misfires, rough idle, and hesitation caused by weak or failed coils.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep hands/tools away from the radiator fan area (it can turn on unexpectedly).
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Don’t pull on wiring—only pull on connectors.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" socket extension
• Torque wrench (in-lb or low-range ft-lb)
• Flat trim tool
• 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.
• 🔋 Use a 10mm socket to disconnect the negative battery cable and move it aside so it can’t spring back.
• 🧠 Dielectric grease is a silicone grease that helps keep moisture out of the rubber boot.

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

Step 2: Locate the ignition coils

• The coils sit on top of the valve cover in a row (4 total), one per cylinder.
• Use a shop light so you can clearly see each coil connector and bolt.

Step 3: Unplug the coil electrical connector

• Use a flat trim tool to gently help press the connector lock tab (if it’s tight).
• Pull the connector straight off the coil by the plastic housing (not the wires).

Step 4: Remove the coil hold-down bolt

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

Step 5: Remove the ignition coil

• Grip the coil and gently twist it left-right to break the boot free.
• Pull the coil straight up and out of the spark plug tube.
• If it’s stuck, twist more—don’t pry hard.

Step 6: Prep and install the new coil

• Put a small, thin smear of dielectric grease inside the new coil’s rubber boot (just a light coating).
• Slide the new coil straight down into the spark plug tube until it fully seats.

Step 7: Reinstall and torque the coil bolt

• Thread the bolt in by hand first to avoid cross-threading.
• Use a torque wrench with a 10mm socket to tighten the bolt: Torque to 12 Nm (9 ft-lbs).
• A torque wrench is a tool that tightens fasteners to an exact setting.

Step 8: Reconnect the electrical connector

• Push the connector onto the coil until it clicks/locks in place.

Step 9: Repeat for the remaining coils

• Replace the other 3 coils the same way (recommended to keep them even in age and performance).
• Work one coil at a time to avoid mix-ups.

Step 10: Reinstall the engine cover and reconnect the battery

• Reinstall the engine 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 flashing check engine light.
• 🔎 If the check engine light stays on, the stored code may need to be cleared after the fix (or it may clear after a few drive cycles).
• 🛠️ If you found oil down in a spark plug tube, your valve cover gasket or tube seals may be leaking.
• 🚗 Take a short test drive and recheck for any stumble under acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $250-$600 (parts + labor)

DIY Cost: $120-$360 (parts only)

You Save: $130-$240 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.