🔧 Tucson - Ignition Coil Replacement

Your Tucson uses one ignition coil per cylinder (4 total). Replacing a bad coil restores smooth running and prevents misfires that can damage the catalytic converter.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; coils sit on the hot valve cover.
• ⚠️ Turn ignition OFF and keep the key/fob away from the vehicle.
• ⚠️ Disconnect the negative battery cable if you’re worried about accidentally shorting a connector.
• ⚠️ Don’t pull on wiring—only pull on the connector body.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8" drive ratchet
• 3" socket extension
• Torque wrench (5-30 Nm range)
• Plastic trim tool
• 10mm wrench
• 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

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📋 Before You Begin

• Park on level ground and let the engine cool fully.
• Open the hood and remove any loose clothing/jewelry.
• If disconnecting the battery: use a 10mm wrench to remove the negative (-) cable and tuck it aside so it can’t spring back.
• Dielectric grease helps prevent moisture issues.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use your hands to pull the engine cover straight up (it’s held by rubber grommets).
• If it feels stuck, gently pry upward with a plastic trim tool near a corner.

Step 2: Locate the ignition coils

• You’ll see 4 coils lined up on top of the engine (one per cylinder), each with an electrical connector and a single hold-down bolt.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab with your thumb, then pull the connector straight back.
• If the tab is stubborn, use a plastic trim tool to gently help lift the lock (don’t break it).

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 3" extension, and ratchet to remove the bolt.
• Set the bolt somewhere safe so it doesn’t fall into the engine bay.

Step 5: Pull the coil out

• Grip the coil body and pull straight up while gently twisting left-right.
• Twist gently—don’t pry on the valve cover.

Step 6: Install the new coil

• Put a small smear of dielectric grease inside the new coil boot (the rubber end that goes down onto the spark plug).
• Push the coil straight down until it fully seats on the spark plug.

Step 7: Reinstall and torque the hold-down bolt

• Start the bolt by hand first (prevents cross-threading).
• Use a 10mm socket to snug it down.
• Use a torque wrench and 10mm socket: Torque to 9.8 Nm (7 ft-lbs).

Step 8: Reconnect the electrical connector

• Push the connector in until it clicks/locks.

Step 9: Repeat for any other coils you’re replacing

• Replace one coil at a time so connectors don’t get mixed up.

Step 10: Reinstall the engine cover and reconnect battery (if removed)

• Press the engine cover back onto its grommets.
• If you disconnected the battery: use a 10mm wrench to reinstall and tighten the negative (-) terminal.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smooth.
• If the check engine light was on, it may need a scan tool to clear the code after the fix.
• Test drive 10-15 minutes and recheck for warning lights or rough running.
• If it still misfires, the next common items are spark plugs or a wiring/connector issue.

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💰 DIY vs Shop Cost

Shop Cost: $180-$500 (parts + labor, depends on how many coils)

DIY Cost: $45-$320 (parts only, depends on how many coils)

You Save: $135-$180 by doing it yourself! (single coil) to $200+ (multiple coils)

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.