🔧 Tucson - Ignition Coil Replacement

Your Tucson’s ignition coils sit on top of the spark plugs and provide the high voltage needed to fire each cylinder. Replacing a weak coil can fix misfires, rough idle, and flashing check-engine lights. This job is straightforward because the coils are easy to access on the 2.0L.

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 exhaust and cylinder head.
• ⚠️ Keep the key away from the vehicle so the engine can’t be started accidentally.
• ⚠️ If you disconnect the battery, you may lose radio presets.
• ⚠️ Don’t pull on wiring—always release the connector lock/tab first.

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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 (3/8")
• Plastic trim tool
• Nitrile gloves
• Safety glasses
• OBD2 scan tool (specialty)

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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, shift to Park, and set the parking brake.
• Open the hood and confirm the engine is cool to the touch.
• If you’re a first-timer, disconnect the negative battery terminal to be safe (negative terminal is the “-” side).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use a plastic trim tool to gently pry up if needed, then pull the cover straight upward to release the rubber grommets.
• Lift evenly so you don’t crack it.

Step 2: Locate the ignition coils

• You’ll see 4 coils in a row on top of the engine valve cover, each with an electrical connector.

Step 3: Unplug the coil electrical connector

• Press the connector lock/tab and pull the connector straight off by hand.
• If it’s stubborn, use a plastic trim tool to help lift the lock gently—don’t use a metal screwdriver.
• Wiggle the plug; don’t yank wires.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 3/8" ratchet, and 3/8" extension (3"–6") to remove the single bolt holding the coil down.

Step 5: Pull the coil out

• Twist the coil slightly, then pull straight upward to remove it from the spark plug well.
• This “spark plug well” is the deep tube the spark plug sits in.

Step 6: Prep and install the new coil

• Put a small dab of dielectric grease inside the new coil boot (the rubber end). This helps sealing and future removal.
• Push the new coil straight down until it fully seats on the spark plug.

Step 7: Reinstall and torque the coil bolt

• Thread the bolt in by hand first to avoid cross-threading.
• Use a 10mm socket, 3/8" ratchet, then tighten with a torque wrench (3/8").
• Torque to 9.8 Nm (7 ft-lbs)

Step 8: Reconnect the coil connector

• Push the connector on until it clicks/locks.

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

• Repeat Steps 3–8 for the remaining coils.
• Do one coil at a time to avoid mix-ups.

Step 10: Reinstall the engine cover

• Line up the cover grommets with the posts and press straight down firmly.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth with no shaking.
• If the check engine light was on, use an OBD2 scan tool (specialty) to clear codes and confirm the misfire doesn’t return.
• Take a short test drive and recheck that the engine cover is seated and no connectors are loose.

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💰 DIY vs Shop Cost

Shop Cost: $180–$550 (parts + labor, depending on 1 coil vs all 4)

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

You Save: $140–$230+ 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.