🔧 Sorento - Ignition Coil Replacement

On your Sorento, each cylinder has its own ignition coil (coil-on-plug) that sits right on top of the spark plug. Replacing a bad coil restores smooth running and fixes misfires (often felt as shaking, flashing check-engine light, or loss of power).

Difficulty Level: Intermediate | Estimated Time: 1.5-3.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Keep dirt out of the intake ports; cover openings immediately if the intake is removed.
• ⚠️ If the check engine light is flashing, avoid driving hard until repaired (catalyst damage risk).

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 3/8" drive universal swivel joint
• Torque wrench (inch-pound)
• Torque wrench (foot-pound)
• Flat trim removal tool
• Needle-nose pliers
• Pick tool
• Clean shop towels
• Masking tape and marker
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-6
• Upper intake manifold gasket set - Qty: 1
• Throttle body gasket - Qty: 1
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Disconnect the negative battery terminal using a 10mm socket and move the cable aside.
• Use masking tape and marker to label any vacuum hoses/connectors you remove so everything goes back correctly.
• Assumption: Rear-bank coils require upper intake removal on this V6.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Pull up firmly on the plastic engine cover to release the grommets (rubber mounts).
• Use a flat trim removal tool if you need gentle leverage.

Step 2: Replace front-bank ignition coils (easy access)

• Locate the coils on the front cylinder bank (closest to the radiator).
• Unplug the coil connector by lifting the lock tab with a pick tool, then pull the connector off.
• Remove the coil hold-down bolt using a 10mm socket and 3/8" ratchet.
• Twist the coil gently, then pull it straight up to remove it.
• Add a tiny smear of dielectric grease inside the new coil boot. (Dielectric grease is a non-conductive grease that helps seal out moisture.)
• Install the new coil by pushing straight down until fully seated.
• Install the hold-down bolt and Torque to 9.8 Nm (87 in-lbs) using an inch-pound torque wrench.
• Reconnect the electrical connector until it clicks.

Step 3: Remove the air intake ducting (to reach the intake manifold area)

• Loosen the hose clamp(s) using a 10mm socket.
• Disconnect any small breather hose(s) using needle-nose pliers to move the clamp.
• Lift the intake duct/air tube out and set it aside.

Step 4: Unplug and remove the throttle body (if it blocks intake removal)

• Unplug the throttle body electrical connector by releasing the lock with a pick tool.
• Remove the throttle body mounting bolts using a 10mm socket and extension.
• Remove the throttle body and old gasket. Use clean shop towels to cover the opening.
• When reinstalling later: Torque throttle body bolts to 9.8 Nm (87 in-lbs).

Step 5: Remove the upper intake manifold (to access rear-bank coils)

• Label and disconnect vacuum hoses and connectors using masking tape and marker.
• Remove any brackets/fasteners in the way using a 12mm socket or 14mm socket as needed.
• Remove the upper intake manifold bolts using a 12mm socket, extension, and ratchet.
• Lift the upper intake manifold off carefully.
• Immediately stuff each exposed intake runner with a clean shop towel so nothing can fall in.
• When reinstalling later: Torque upper intake manifold bolts to 21 Nm (15 ft-lbs) using a foot-pound torque wrench.

Step 6: Replace rear-bank ignition coils

• With the upper intake off, the rear coils are now visible.
• Unplug each coil connector using a pick tool to release the lock.
• Remove each coil hold-down bolt using a 10mm socket and ratchet.
• Remove and replace coils one at a time to avoid mixing connectors.
• Install hold-down bolts and Torque to 9.8 Nm (87 in-lbs).
• Reconnect each electrical connector until it clicks.

Step 7: Reassemble the intake system

• Remove the shop towels from the intake ports (count them to ensure none are left behind).
• Install new upper intake manifold gaskets, then set the manifold in place.
• Tighten bolts evenly, working from the center outward, using a 12mm socket.
• Torque upper intake manifold bolts to 21 Nm (15 ft-lbs).
• Install the throttle body with a new throttle body gasket using a 10mm socket.
• Torque throttle body bolts to 9.8 Nm (87 in-lbs).
• Reinstall the intake ducting and tighten clamps using a 10mm socket.
• Reinstall the engine cover by pressing it down onto the grommets.

Step 8: Reconnect the battery

• Reconnect the negative battery terminal using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 2-3 minutes. It should run smooth with no shaking.
• Check for vacuum leaks: listen for hissing and confirm idle is steady.
• If the check-engine light was on, it may clear after a few drive cycles; if it stays on, the misfire code may need clearing with a scan tool.
• Road test for 10-15 minutes. Recheck for any fuel/vacuum smell and recheck clamps/hoses.

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💰 DIY vs Shop Cost

Shop Cost: $350-$900 (parts + labor)

DIY Cost: $60-$450 (parts only)

You Save: $290-$450 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.5 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.