🔧 Outback - Ignition Coil Replacement

Your Outback has one ignition coil per cylinder. A bad coil can cause a misfire (shaking, flashing check engine light, loss of power), and replacing the coil(s) restores proper spark.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before starting; the exhaust and cylinder heads get very hot.
• ⚠️ Disconnect the negative battery cable before unplugging coils to prevent shorts.
• ⚠️ If the check engine light is flashing, avoid driving; it can damage the catalytic converter.
• ⚠️ Pull on electrical connectors by the plug body, not the wires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 3" extension
• 6" extension
• Universal joint adapter
• Torque wrench (in-lb or low-range ft-lb)
• Flathead screwdriver
• Trim clip removal tool
• Needle-nose pliers
• OBD2 scan tool
• Nitrile gloves
• Safety glasses
• Fender cover

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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 install a fender cover to protect paint.
• Disconnect the battery: use a 10mm socket to remove the negative (–) cable and move it aside so it can’t spring back.
• Plan to replace coils one at a time. This prevents mixing up connectors.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Grab the cover near the corners and pull upward to release the grommets.
• Set it aside where it won’t get stepped on.

Step 2: Make room to access the coils

• Left side (driver side) access: Use a flathead screwdriver to loosen intake hose clamps, then lift the intake snorkel/duct out of the way.
• Right side (passenger side) access: If access is tight, use a 10mm socket to remove the battery hold-down, then lift the battery out. It’s heavy—lift with your legs.
• If any plastic push-clips are in your way, remove them with a trim clip removal tool.

Step 3: Unplug the coil electrical connector

• Locate the coil on the side of the engine; it’s the small module bolted to the valve cover with a rubber boot going into the cylinder head.
• Press the connector lock tab and pull the connector straight off.
• If it’s stuck, gently help it with needle-nose pliers on the connector body (not the wires).

Step 4: Remove the ignition coil retaining bolt

• Use a 10mm socket, ratchet, and a 3" or 6" extension to remove the coil bolt.
• If the angle is awkward, add the universal joint adapter.

Step 5: Pull the coil out

• Twist the coil slightly, then pull it straight out to remove the boot from the spark plug.
• Check for oil in the spark plug tube. If you see oil, stop and address the leak before installing the new coil (oil can cause repeat misfires).

Step 6: Install the new coil

• Put a tiny dab of dielectric grease inside the end of the coil boot. (Dielectric grease is a non-conductive grease that helps prevent moisture and makes future removal easier.)
• Push the coil straight onto the spark plug until it fully seats.
• Reinstall the coil bolt using a 10mm socket, then tighten with a torque wrench: Torque to 6.4 Nm (4.7 ft-lbs).

Step 7: Reconnect the coil connector

• Push the connector on until you feel/hear it click.
• Lightly tug it to confirm it’s locked.

Step 8: Repeat for any other coils you’re replacing

• Replace coils one at a time so you don’t mix up connectors.
• If you’re chasing a misfire code, match the cylinder noted by your scan tool before replacing more parts.

Step 9: Reassemble what you removed

• Reinstall the battery and hold-down using a 10mm socket (if removed).
• Reinstall the intake duct/snorkel and tighten clamps with a flathead screwdriver.
• Reinstall the engine cover by lining it up and pressing downward.

Step 10: Reconnect the battery

• Reconnect the negative (–) cable and tighten with a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smooth with no shaking.
• Use an OBD2 scan tool to clear any misfire codes, then road test for 10-15 minutes.
• Re-check that all intake clamps and electrical connectors are fully seated.
• If the same misfire returns, the next common checks are spark plugs, injector, and compression (diagnosis needed before buying more parts).

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💰 DIY vs Shop Cost

Shop Cost: $250-$650 (parts + labor)

DIY Cost: $60-$400 (parts only)

You Save: $190-$250+ by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 hours.

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🎯 Ready to get started?

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