🔧 Sorento - Spark Plug Replacement

On your Sorento’s 2.0L turbo engine, the spark plugs sit under the ignition coils on top of the valve cover. Replacing them restores smooth starting, fuel economy, and helps prevent misfires under boost.

Difficulty Level: Intermediate | Estimated Time: 1.0-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before starting; the aluminum cylinder head threads can be damaged if plugs are removed hot.
• ⚠️ Keep dirt out of the spark plug holes; debris can fall into the cylinder and cause damage.
• ⚠️ If you disconnect the battery, you may lose radio presets; use a 10mm and remove the negative terminal first.
• ⚠️ Do not over-tighten spark plugs; use a torque wrench.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 3/8" drive swivel joint
• 5/8" (16mm) spark plug socket
• 3/8" drive torque wrench (10-60 ft-lbs range)
• Small flat trim tool
• Compressed air blow gun
• Dielectric grease

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (OEM-spec iridium) - Qty: 4

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool completely.
• If you choose to disconnect the battery: use a 10mm socket to remove the negative terminal and isolate it so it can’t spring back.
• Lay out the new plugs in order; you’ll replace them one cylinder at a time to avoid mixing connectors.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Lift the cover straight up by hand; if it’s clipped, use a small flat trim tool gently at the corners.

Step 2: Unplug and remove ignition coils

• Work on one coil at a time.
• Press the electrical connector lock and pull the connector off; use a small flat trim tool only if the lock is stubborn. Don’t pry on the wires.
• Remove the coil hold-down bolt using a 10mm socket and 3/8" ratchet.
• Twist the coil boot slightly, then pull the coil straight up and out.

Step 3: Clean the spark plug wells

• Blow compressed air down into the spark plug well using a compressed air blow gun.
• This prevents sand/dirt from falling into the cylinder when the plug comes out.

Step 4: Remove the old spark plug

• Install the 5/8" (16mm) spark plug socket onto a 3/8" extension and 3/8" ratchet.
• Lower the socket straight down into the well and loosen the plug.
• Lift the plug out with the socket (most spark plug sockets have a rubber insert to “grab” the plug).

Step 5: Install the new spark plug

• Confirm the new plug matches the old plug (length and tip style).
• Start the plug by hand first: put the new plug in the spark plug socket and thread it in using only the extension (no ratchet) until it seats. This helps prevent cross-threading (threading in crooked).
• Torque the spark plug with a 3/8" drive torque wrench: Torque to 25 Nm (18 ft-lbs).
• If it doesn’t thread easily, stop and realign.

Step 6: Reinstall the ignition coil

• Apply a small dab of dielectric grease inside the coil boot (it helps prevent moisture and makes future removal easier).
• Push the coil straight down onto the plug until fully seated.
• Install the coil bolt with a 10mm socket, then tighten with a torque wrench: Torque to 9.8 Nm (7 ft-lbs).
• Reconnect the electrical connector until it clicks.

Step 7: Repeat for the remaining cylinders

• Repeat Steps 2–6 for the other 3 spark plugs, one coil at a time.

Step 8: Reinstall the engine cover and restore power

• Press the engine cover back into place.
• If disconnected, reconnect the negative battery terminal using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 30–60 seconds; it should run smooth with no flashing check engine light.
• If the engine runs rough, re-check that each coil connector is fully clicked in and each coil bolt is installed.
• Test drive 10–15 minutes and verify normal power under acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $60-$140 (parts only)

You Save: $190-$310 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 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.