🔧 Niro - Ignition Coil Replacement

Your Niro uses coil-on-plug ignition coils (one coil per cylinder) mounted on top of the engine. Replacing a bad coil can fix misfires, rough idle, and a flashing check-engine light, and it’s a straightforward under-hood job.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns.
• ⚠️ This is a Plug-In Hybrid: do not touch or disturb any orange high-voltage cables/connectors.
• ⚠️ Keep metal tools away from the 12V battery positive terminal to prevent short circuits.
• ⚠️ Battery disconnect is not required, but disconnecting the 12V negative terminal prevents accidental shorts.

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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 Nm range)
• Small flathead screwdriver
• Plastic trim tool
• 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 power the vehicle OFF.
• 🔑 Keep the key fob at least 10 feet away so the system can’t wake up.
• 🔋 Optional: Disconnect the 12V negative battery terminal using a 10mm socket.
• 🧼 Blow/brush dirt away from the coil area so debris can’t fall into the plug wells.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a plastic trim tool to gently lift the cover corners if it feels stuck.
• Pull upward evenly by hand to pop it off the rubber grommets.

Step 2: Locate the ignition coils

• The coils sit on top of the valve cover in a row (one per cylinder) with an electrical connector on each.
• Take a quick photo for reference.

Step 3: Unplug the coil electrical connector

• Use a small flathead screwdriver only if needed to help lift the lock tab.
• Press the release tab and pull the connector straight back (don’t pull on the wires).

Step 4: Remove the coil retaining bolt

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

Step 5: Remove the ignition coil

• Grip the coil body and twist slightly left-right to break the seal.
• Pull the coil straight up out of the spark plug well.

Step 6: Install the new ignition coil

• Apply a very small amount of dielectric grease inside the rubber boot (this helps prevent moisture and makes future removal easier).
• Push the coil straight down until it fully seats on the spark plug.
• Reinstall the retaining bolt by hand first to avoid cross-threading.
• Tighten with a torque wrench: Torque to 7.8 Nm (69 in-lb).

Step 7: Reconnect the electrical connector

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

Step 8: Repeat for the remaining coils

• Repeat Steps 3–7 for each cylinder.
• Do one coil at a time to avoid mix-ups.

Step 9: Reinstall the engine cover

• Align the cover over the mounting points and press down firmly by hand until it seats.

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✅ After Repair

• 🔌 If you disconnected the 12V battery, reconnect it using a 10mm socket and ensure the terminal is snug.
• 🚗 Start the engine and let it idle for 1–2 minutes; it should run smooth with no shaking.
• 🧪 Road test for 10–15 minutes and recheck for a check-engine light.
• 🛠️ If the check-engine light was on, clearing codes with a scan tool is recommended after confirming the fix.

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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.