🔧 XT4 - Ignition Coil Replacement

Your XT4 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 flashing check-engine light.

Difficulty Level: Beginner | Estimated Time: 0.5-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before working near the turbo/engine cover area.
• ⚠️ Turn ignition OFF and keep the key/fob away from the vehicle so it can’t “wake up” while you’re unplugging coils.
• ⚠️ Disconnect the negative battery cable if you’re worried about accidental shorts.
• ⚠️ Never pull on wiring; always pull on the connector body.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8" ratchet
• 3/8" extension (3"-6")
• Torque wrench (in-lb or Nm range)
• Plastic trim removal tool
• Small pick tool
• Dielectric grease
• 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 if replacing all)
• Ignition coil boot (if not included with coil) - Qty: 1 (or Qty: 4)

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and let the engine cool.
• If disconnecting the battery: use a 10mm socket to remove the negative (-) cable and isolate it so it can’t spring back.
• Decide your approach: replacing 1 coil is OK, but if mileage is high and one failed, many owners replace all 4 to prevent repeat issues.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use your hands to pull the engine cover straight upward to release the rubber grommets.
• If it feels stuck, use a plastic trim removal tool to gently lift at a corner. Pull up—don’t pry hard.

Step 2: Locate the ignition coils

• The coils are the 4 identical modules lined up on top of the engine, each with an electrical connector.
• Pick the cylinder you’re replacing (or work left-to-right so you don’t lose track).

Step 3: Unplug the coil electrical connector

• Use a small pick tool only if needed to gently lift the connector lock/tab.
• Press the release and pull the connector straight off the coil (pull the plastic connector, not the wires).

Step 4: Remove the coil retaining bolt

• Use a 10mm socket, 3/8" ratchet, and 3/8" extension to remove the coil bolt.
• Set the bolt aside on a shop towel so it doesn’t disappear.

Step 5: Remove the ignition coil

• Grip the coil and twist it gently left-right to break the seal, then pull straight upward.
• If the rubber boot stays stuck on the spark plug, use your hand to remove it and transfer it only if your new coil doesn’t include a new boot.

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 prevent moisture and makes future removal easier).
• Push the coil straight down onto the spark plug until you feel it seat fully.
• Reinstall the retaining bolt by hand first to avoid cross-threading.
• Use a torque wrench to tighten the coil bolt: Torque to 10 Nm (89 in-lbs).

Step 7: Reconnect the coil connector

• Push the connector on until it clicks/locks in place.
• Gently tug the connector to confirm it’s fully seated.

Step 8: Reinstall the engine cover

• Line up the cover with the mounting points and press straight down with your hands until it snaps into the grommets.

Step 9: Reconnect the battery (if disconnected)

• Use a 10mm socket to tighten the negative (-) terminal clamp snugly.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds. It should run smoothly.
• If you had a check-engine light from a misfire, it may take a few drive cycles to turn off, or you can clear codes with a scan tool.
• Take a short test drive and confirm no hesitation under light acceleration.
• If the misfire remains, the next most common causes are the spark plug, injector, or a wiring/connector issue on that cylinder.

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💰 DIY vs Shop Cost

Shop Cost: $250-$650 (parts + labor, depends on replacing 1 coil vs all 4)

DIY Cost: $40-$280 (parts only)

You Save: $210-$370 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.