🔧 C-HR - Ignition Coil Replacement

Your C-HR uses coil-on-plug ignition coils (one coil per cylinder) mounted right on top of the spark plugs. Replacing a bad coil can fix misfires, rough running, and flashing check engine lights.

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

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⚠️ Safety & Precautions

• 🔥 Let the engine cool fully before starting (hot parts burn).
• ⚡ Turn ignition OFF and keep the key/fob away from the car while you work.
• 🔋 Battery disconnect is recommended: remove the negative terminal to prevent accidental shorts.
• 🧼 Keep dirt out of the spark plug wells—debris can cause misfires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 6" extension (1/4")
• Torque wrench (inch-pound)
• Plastic trim tool
• Needle-nose pliers
• Compressed air blow gun
• Shop towels
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 4 to replace all)
• 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.
• Disconnect the battery negative terminal using a 10mm socket.
• Blow off loose dust around the top of the engine using a compressed air blow gun.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Grab the plastic engine cover and pull straight up to release it from the rubber grommets.
• If it feels stuck, gently pry at a corner with a plastic trim tool and lift again.

Step 2: Locate the ignition coils

• You’ll see 4 ignition coils in a row on top of the engine.
• One coil serves one cylinder.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight off.
• If the tab is hard to press, use needle-nose pliers gently (don’t crush it).

Step 4: Remove the ignition coil hold-down bolt

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

Step 5: Remove the ignition coil

• Twist the coil slightly left-right to break it loose, then pull straight up.
• If you see oil in the spark plug tube, stop—tell me, because that points to a valve cover tube seal leak.

Step 6: Prep and install the new coil

• Put a tiny smear of dielectric grease inside the rubber boot (the rubber “socket” on the coil that touches the spark plug). Helps prevent sticking and moisture.
• Push the coil straight down until it fully seats on the spark plug.

Step 7: Reinstall the coil bolt and torque it

• Thread the bolt in by hand first (prevents cross-threading).
• Tighten using a torque wrench (inch-pound): Torque to 9 Nm (80 in-lb).

Step 8: Reconnect the coil connector

• Push the connector on until it clicks.
• Gently tug to confirm it’s locked.

Step 9: Repeat for any other coils

• Repeat Steps 3–8 for the remaining cylinders if you’re replacing more than one coil.

Step 10: Reinstall engine cover and reconnect battery

• Press the engine cover back onto the grommets until it snaps into place.
• Reconnect the battery negative terminal using a 10mm socket.

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✅ After Repair

• Start your C-HR and let it idle for 30–60 seconds. It should run smooth.
• Check that the check engine light is off (or not flashing). If it stays on, the code may need clearing.
• Road test for 10–15 minutes and re-check for roughness or hesitation.
• If you replaced only one coil and misfire returns, consider replacing the remaining coils as a set.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor)

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

You Save: $135-$130 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.