🔧 Accord - Ignition Coil Replacement

Your Accord uses one ignition coil per cylinder (4 total). Replacing a weak or failed coil can fix misfires, rough idle, flashing 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 before working near the cylinder head (hot metal can burn).
• ⚠️ Keep the key out of the car so the engine can’t be started accidentally.
• ⚠️ Don’t pull on wiring—press the connector tab and pull the plug body.
• ⚠️ Battery disconnect is not required, but if you disconnect it, you may reset radio presets and idle memory.

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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)
• Small flathead screwdriver
• Shop flashlight
• 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 Park, and set the parking brake.
• Open the hood and let the engine cool fully.
• Tip: Replace coils one-at-a-time to avoid mix-ups.

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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, 1/4" drive ratchet, and 6" extension (1/4" drive) to remove the cover fasteners.
• Lift the cover straight up and set it aside.

Step 2: Locate the ignition coils

• Use a shop flashlight to find the 4 coils lined up on top of the engine (one per cylinder).
• Each coil has an electrical connector and a single small hold-down bolt.

Step 3: Unplug the coil connector

• Press the connector lock tab. If it’s stubborn, gently help the tab with a small flathead screwdriver.
• Pull the connector straight off the coil.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 1/4" drive ratchet, and 6" extension (1/4" drive) to remove the bolt.
• Set the bolt somewhere safe (they’re easy to drop).

Step 5: Remove the ignition coil

• Grip the coil and twist it slightly left-right to break the seal, then pull straight up.
• If it feels stuck, keep twisting gently—don’t pry hard on the valve cover.

Step 6: Install the new ignition coil

• Apply a small pea-sized amount of dielectric grease inside the rubber boot (this helps moisture sealing and future removal).
• Push the coil straight down onto the spark plug until it fully seats.

Step 7: Reinstall and torque the hold-down bolt

• Start the bolt by hand to prevent cross-threading.
• Use a torque wrench with a 10mm socket to tighten the bolt: Torque to 12 Nm (9 ft-lbs).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks/locks.
• Lightly tug the connector to confirm it’s secure.

Step 9: Repeat for the remaining coils

• Repeat Steps 3–8 for the other cylinders, one coil at a time.

Step 10: Reinstall the engine cover

• Set the cover back in place.
• Use a 10mm socket, 1/4" drive ratchet, and 6" extension (1/4" drive) to tighten the fasteners snugly.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth.
• Take a short test drive and confirm there’s no hesitation under acceleration.
• If the check-engine light was on, it may clear on its own after a few drive cycles; otherwise, use a basic OBD2 scanner to clear codes after confirming the fix.
• If you still have a misfire, the next most common cause is worn spark plugs or an injector issue.

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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.