🔧 Ignition Coils - Replacement

Your Outback uses a flat-four engine, so the ignition coils sit on the sides of the engine and are easy to reach once the intake ducting is out of the way. Replacing a weak coil can fix misfires, rough idle, hesitation, and check-engine lights.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• Let the engine cool fully before starting. Coils sit near hot engine parts.
• Turn the ignition off and remove the key before unplugging any coil connectors.
• Disconnect the negative battery terminal if you want maximum safety while working near wiring.
• Keep dirt out of the spark plug wells. Debris can cause misfires after the repair.
• Do not pull on the wire itself when removing connectors. Use the connector body.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8-inch ratchet
• 3-inch extension
• Flat trim tool
• Torque wrench
• Needle-nose pliers
• Dielectric grease
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 4

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool completely.
• If the engine is misfiring badly, avoid driving it far before repair.
• Work one cylinder at a time so plug wire routing and connectors stay organized.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake tube

• Use your hands to lift off the engine cover if equipped.
• Use a screwdriver or small socket if needed to loosen the air intake duct clamps.
• Remove the intake tube enough to clear access to the ignition coils.
• Keep all clamps in order.

Step 2: Disconnect the battery if desired

• Use a 10mm socket to disconnect the negative battery terminal.
• Set the cable aside so it cannot touch the battery post.
• This is optional, but it reduces the chance of a short while unplugging coils.

Step 3: Unplug the ignition coil

• Find the coil on the side of the engine for the cylinder you are replacing.
• Press the lock tab and gently unplug the connector.
• If the plug is stuck, use a flat trim tool to help release the tab without breaking it.

Step 4: Remove the ignition coil

• Use a 10mm socket, 3/8-inch ratchet, and 3-inch extension to remove the coil hold-down bolt.
• Pull the coil straight out of the spark plug well.
• If it resists, twist it slightly while pulling upward.

Step 5: Inspect the spark plug well

• Look for oil, water, rust, or debris in the well.
• If debris is present, remove it before installing the new coil.
• A clean well prevents repeat misfires.

Step 6: Install the new ignition coil

• Apply a small amount of dielectric grease inside the coil boot if desired.
• Push the new coil straight down onto the spark plug until fully seated.
• Install the hold-down bolt by hand first.
• Use a 10mm socket and torque wrench to tighten the bolt to 7.5 Nm (66 in-lbs).

Step 7: Reconnect the electrical connector

• Push the connector onto the new coil until the lock clicks.
• Make sure the connector is fully seated and cannot pull back off easily.

Step 8: Reinstall the intake tube and engine cover

• Reinstall the intake duct and tighten the clamps.
• Reinstall the engine cover if removed.
• If you disconnected the battery, reconnect the negative terminal with a 10mm socket.

Step 9: Repeat for the remaining coils if needed

• If one coil has failed due to age, check the others closely.
• Replace any coil that shows cracking, oil damage, or heat damage.

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✅ After Repair

• Start the engine and let it idle.
• Confirm the idle is smooth and the check-engine light is off.
• If the light stays on, clear codes with a scan tool and recheck for misfires.
• Take a short test drive and make sure acceleration is normal.

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💰 DIY vs Shop Cost

Shop Cost: $320-$650 (parts + labor)

DIY Cost: $120-$260 (parts only)

You Save: $200-$390 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 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.