🔧 Fit - Ignition Coil Replacement

Replacing the ignition coils on your Fit is a beginner-friendly job. The coils sit on top of the engine and send high voltage to the spark plugs, so a weak coil can cause misfires, rough idle, poor fuel economy, or a flashing check engine light.

Difficulty Level: Beginner | Estimated Time: 30-60 minutes

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before working near the ignition coils.
• ⚠️ Disconnect the negative battery cable to prevent accidental electrical shorts.
• ⚠️ Do not pull on coil wiring. Always press the connector tab and pull the connector body.
• ⚠️ Replace coils one at a time so the connectors and coil positions do not get mixed up.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8-inch ratchet
• 3-inch extension
• 10mm wrench
• Torque wrench inch-pound range
• Plastic trim tool
• Compressed air nozzle
• OBD2 scan tool
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-4
• Dielectric grease - Qty: 1 small tube

Tip: If one coil failed from age or mileage, replacing all four can prevent repeat misfires.

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📋 Before You Begin

• 🅿️ Park your Fit on level ground and set the parking brake.
• ❄️ Make sure the engine is cool to the touch.
• 🔋 Use a 10mm wrench to disconnect the negative battery cable, then move it aside so it cannot touch the battery post.
• 🧰 Keep the new coils in their boxes until you install them to avoid dirt entering the rubber boots.
• 📟 If the check engine light is on, use an OBD2 scan tool to note any misfire codes before clearing them. A scan tool plugs into the diagnostic port and reads fault codes.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open The Hood And Locate The Coils

• Use the hood release inside the cabin, then lift the hood and support it with the prop rod.
• Look at the top of the engine. The four ignition coils are lined up across the top of the valve cover.
• Each coil has an electrical connector and one 10mm retaining bolt.

Step 2: Remove Any Plastic Cover Or Harness Clip If Blocking Access

• If a small plastic cover or wiring clip blocks a coil, use a plastic trim tool to gently release it.
• A plastic trim tool is a non-metal pry tool that helps release clips without scratching or breaking them.
• Do not force brittle plastic clips. Press the locking tab first, then lift gently.

Step 3: Clean Around The Ignition Coils

• Put on safety glasses.
• Use a compressed air nozzle to blow dust and grit away from the top of each ignition coil.
• This helps keep dirt from falling into the spark plug tubes when the coils are removed.
• Clean first. Dirt causes problems later.

Step 4: Disconnect The First Coil Connector

• Use your fingers to press the locking tab on the electrical connector.
• Pull the connector straight back by the plastic connector body.
• If it is stuck, use a plastic trim tool to gently help release the tab.
• Do not pull on the wires.

Step 5: Remove The Coil Retaining Bolt

• Use a 10mm socket, 3-inch extension, and 3/8-inch ratchet to remove the ignition coil retaining bolt.
• Set the bolt in a safe place so it does not fall into the engine bay.

Step 6: Remove The Ignition Coil

• Grip the top of the ignition coil by hand.
• Twist it gently left and right to loosen the rubber boot.
• Pull the coil straight upward out of the spark plug tube.
• The rubber boot is the long lower section of the coil that seals around the spark plug.
• Check for oil, water, cracking, burning, or white tracking marks on the old coil boot.

Step 7: Prepare The New Ignition Coil

• Compare the new ignition coil to the old one. The connector shape, bolt tab, and boot length should match.
• Apply a very small amount of dielectric grease inside the end of the rubber boot.
• Dielectric grease is an electrical-safe silicone grease that helps seal out moisture.
• Do not pack the boot full of grease. A thin film is enough.

Step 8: Install The New Ignition Coil

• Push the new coil straight down into the spark plug tube by hand.
• You should feel it seat onto the spark plug.
• Line up the bolt hole with the valve cover mounting point.
• Install the retaining bolt by hand first to avoid cross-threading.

Step 9: Tighten The Coil Bolt

• Use a torque wrench inch-pound range with a 10mm socket to tighten the coil retaining bolt.
• Torque to 12 Nm (9 ft-lbs)
• If your torque wrench reads inch-pounds, tighten to 106 in-lbs.
• Do not overtighten. The mounting area can crack.

Step 10: Reconnect The Electrical Connector

• Push the electrical connector onto the ignition coil until it clicks.
• Lightly tug the connector body to confirm it is locked.

Step 11: Repeat For The Remaining Coils

• Use the same steps for each remaining ignition coil.
• Use a 10mm socket, 3-inch extension, and 3/8-inch ratchet to remove each bolt.
• Use the torque wrench inch-pound range and 10mm socket to tighten each bolt to 12 Nm (9 ft-lbs).
• Work one coil at a time to keep things simple.

Step 12: Reinstall Any Clips Or Covers

• Use your hands to reinstall any plastic cover or wiring clip removed earlier.
• If needed, use the plastic trim tool to guide clips into place gently.
• Make sure no wiring harness is pinched or resting tightly against hot engine parts.

Step 13: Reconnect The Battery

• Place the negative battery cable back onto the battery post.
• Use a 10mm wrench to tighten the negative terminal nut.
• Torque to 5 Nm (44 in-lbs)
• Make sure the terminal does not twist by hand after tightening.

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✅ After Repair

• ✅ Start your Fit and let it idle for 1-2 minutes.
• ✅ The idle should feel smooth with no shaking or flashing check engine light.
• ✅ Use an OBD2 scan tool to clear stored misfire codes if the repair fixed the issue.
• ✅ Take a short test drive with gentle acceleration first, then normal acceleration.
• ✅ If the check engine light returns, scan the codes again before replacing more parts.
• ✅ If oil was found inside a spark plug tube, the valve cover tube seals may also need repair.

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💰 DIY vs Shop Cost

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

DIY Cost: $45-$320 (parts only)

You Save: $150-$330 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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