🔧 Accord - Ignition Coil Replacement

Your Accord uses one ignition coil per cylinder (4 total). Replacing a bad coil restores smooth running, fixes misfires, and can prevent a flashing check-engine light from damaging the catalytic converter.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; the exhaust side gets very hot.
• ⚠️ Turn the key OFF and keep it out of the ignition while working.
• ⚠️ If the check engine light is flashing, avoid driving until repaired.
• ⚠️ Battery disconnect is not required, but disconnecting the negative terminal helps prevent accidental shorts.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 6" socket extension
• Torque wrench (inch-pound or small ft-lb)
• Flat trim tool
• Dielectric grease applicator (small brush or cotton swab)
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Replace in pairs or all four recommended - Qty: 1-4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and let the engine cool fully.
• If you choose to disconnect the battery: use a 10mm socket to remove the negative terminal and tuck it aside so it can’t spring back.
• Take a quick photo of connectors first.

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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" ratchet to remove the cover fasteners.
• Lift the cover straight up and set it aside.

Step 2: Locate the ignition coils

• The coils sit on top of the valve cover, one per cylinder, in a row.

Step 3: Unplug one coil connector

• Press the connector lock tab and pull the connector straight off.
• If it’s stuck, use a flat trim tool to gently help the tab—don’t pry hard on the wires.

Step 4: Remove the coil hold-down bolt

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

Step 5: Pull the coil out

• Twist the coil slightly left-right, then pull straight up to remove it.
• Inspect the rubber boot (the long rubber part). If you see oil inside the spark plug tube, stop and let me know—this can indicate a leaking valve cover tube seal.

Step 6: Install the new coil

• Put a tiny smear of dielectric grease inside the end of the coil boot. (Dielectric grease is a non-conductive grease that helps seal out moisture and prevents the boot from sticking later.)
• Push the coil straight down until it fully seats on the spark plug.

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 N·m (9 ft-lbs).

Step 8: Plug the connector back in

• Push the connector on until it clicks/locks.

Step 9: Repeat for the remaining coils (if replacing more than one)

• Replace coils one at a time so connectors don’t get mixed up.

Step 10: Reinstall the engine cover and reconnect battery (if disconnected)

• Use a 10mm socket and 1/4" ratchet to reinstall the cover fasteners snugly.
• If disconnected, reinstall the negative battery terminal with a 10mm socket and tighten it snug.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smooth.
• If the check engine light was on, it may stay on until codes are cleared or the car completes a few drive cycles.
• Test drive for 10-15 minutes and re-check for roughness or a flashing light.
• If you still have a misfire, the next common items are spark plugs or a vacuum leak.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor, depending on how many coils)

DIY Cost: $40-$320 (parts only, depending on how many coils)

You Save: $120-$200+ 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.