🔧 Veloster - Ignition Coil Replacement

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

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

---

⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully; coils sit near hot parts.
• ⚠️ Keep the ignition OFF and key away from the car while unplugging coils.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Do not pull on wiring; release connector locks first.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• Torque wrench (inch-pound or low-range Nm)
• Trim clip tool
• Small flathead screwdriver
• Nitrile gloves
• Safety glasses

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 4 if replacing all)
• Dielectric grease - Qty: 1

---

📋 Before You Begin

• Park on level ground, shift to neutral, and set the parking brake.
• Open the hood and let the engine cool completely.
• Use a 10mm socket to disconnect the negative battery terminal (the “-” cable) and move it aside.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Grip the cover and pull straight up to pop it off the rubber grommets.
• If your cover uses clips, use a trim clip tool to release them.

Step 2: Locate the ignition coils

• The coils are on top of the valve cover, lined up in a row—one per cylinder.
• Each coil has an electrical connector and a small hold-down bolt.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight back.
• If it’s stuck, gently help the lock with a small flathead screwdriver (don’t pry hard). Pull on the plug, not the wires.
• Tool note: The lock tab is a small plastic “release” that must be pressed to unplug.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 1/4" ratchet, and 6" extension to remove the bolt.
• Set the bolt somewhere safe so it doesn’t fall into the engine bay.

Step 5: Remove the ignition coil

• Grab the coil body and twist slightly left-right while pulling straight up.
• If it’s tight, keep wiggling—don’t use excessive force or tools that could crack the coil.

Step 6: Install the new coil

• Put a small dab of dielectric grease inside the rubber boot (the rubber “socket” that seals onto the spark plug). This helps prevent moisture and makes future removal easier.
• Push the coil straight down until it fully seats on the spark plug.

Step 7: Reinstall and tighten the coil hold-down bolt

• Start the bolt by hand first (prevents cross-threading).
• Use a torque wrench and 10mm socket: Torque to 8 Nm (71 in-lbs).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks/locks.
• Give it a gentle tug to confirm it’s latched.

Step 9: Repeat for any other coils being replaced

• Do the same steps for the remaining cylinders if you’re replacing more than one coil.
• If one failed, others may be aging too.

Step 10: Reinstall the engine cover and reconnect the battery

• Press the engine cover back onto its grommets until it snaps in place.
• Reconnect the negative battery cable using a 10mm socket and snug it securely.

---

✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smooth.
• If the check-engine light was on for a misfire, it may take a few drive cycles to turn off, or you can clear it with an OBD2 scanner.
• Test drive gently, then do a moderate acceleration pull; confirm no hesitation or flashing check-engine light.
• Re-check that every coil connector is fully clicked in if anything feels off.

---

💰 DIY vs Shop Cost

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

DIY Cost: $40-$320 (parts only, depends on 1 coil vs all 4)

You Save: $140-$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.

---

🎯 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.