🔧 Crosstrek - Ignition Coil Replacement

Your Crosstrek has one ignition coil per cylinder (4 total). Replacing them restores strong spark to the spark plugs and can fix misfires, rough idle, or a flashing check-engine light.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns.
• ⚠️ Disconnect the negative battery terminal before unplugging coils.
• ⚠️ Do not pull on the wiring harness; pull on the connector body.
• ⚠️ Keep dirt out of the spark plug wells (holes) to prevent misfires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3" extension (1/4")
• 6" extension (1/4")
• Universal joint swivel adapter (1/4")
• Torque wrench (inch-pound capable)
• Flathead screwdriver
• Trim clip tool
• Needle-nose pliers
• Shop flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 4 (replace all four for best reliability)
• Dielectric grease - Qty: 1 (optional)

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📋 Before You Begin

• Park on level ground, put the shifter in neutral, and set the parking brake.
• Open the hood and let the engine cool completely.
• Use the 10mm socket to disconnect the negative battery terminal and move it aside so it can’t spring back.
• A “universal joint swivel” helps reach tight bolts.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Pull upward firmly to pop the cover off its rubber grommets (no tools usually needed).
• Set it aside where it won’t get stepped on.

Step 2: Make room to access the rear coils

• Passenger side (air box side): Use the flathead screwdriver to loosen the intake hose clamp(s) and remove the intake snorkel/ducting as needed.
• Driver side (battery side): If access is tight, use the 10mm socket and ratchet to loosen/remove the battery hold-down and carefully shift the battery slightly for access (do not strain cables).
• More space = less broken clips.

Step 3: Replace coil #1 (front passenger-side)

• Locate the coil on top of the valve cover near the front of the engine.
• Press the connector tab and unplug it. Use the needle-nose pliers only to help press the tab—don’t crush the connector.
• Use the 10mm socket, ratchet, and 3" extension (1/4") to remove the coil hold-down bolt.
• Twist the coil gently, then pull it straight out.
• If using grease: apply a tiny smear of dielectric grease inside the rubber boot. Dielectric grease is silicone grease that blocks moisture.
• Push the new coil straight down until fully seated.
• Reinstall the hold-down bolt and Torque to 6.4 Nm (57 in-lbs).
• Plug the connector back in until it clicks.

Step 4: Replace coil #2 (front driver-side)

• Repeat the same steps as Step 3 on the front driver-side coil.
• Use the 10mm socket, ratchet, and 3" extension (1/4").
• Torque to 6.4 Nm (57 in-lbs).

Step 5: Replace coil #3 (rear passenger-side)

• This one is tighter. Use the shop flashlight to locate the coil and bolt.
• Unplug the connector by pressing the tab. If stubborn, use the trim clip tool to gently help the tab—don’t pry hard.
• Use the 10mm socket, ratchet, 6" extension (1/4"), and universal joint swivel adapter (1/4") to remove the hold-down bolt.
• Twist and pull the coil out. Install the new coil fully seated.
• Reinstall the bolt and Torque to 6.4 Nm (57 in-lbs).
• Reconnect the electrical connector until it clicks.

Step 6: Replace coil #4 (rear driver-side)

• Repeat Step 5 on the rear driver-side coil (often tight near the battery area).
• Use the 10mm socket, ratchet, 6" extension (1/4"), and universal joint swivel adapter (1/4").
• Torque to 6.4 Nm (57 in-lbs).

Step 7: Reinstall removed items

• Reinstall intake ducting and tighten hose clamps with the flathead screwdriver.
• If you moved the battery, reinstall/secure it using the 10mm socket and ratchet.
• Reinstall the engine cover by lining it up and pushing straight down.
• Reconnect the negative battery terminal using the 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 2 minutes. Listen for smooth idle.
• If the check-engine light was on, it may take a few drive cycles to clear, or you can clear codes with a scan tool.
• Take a short test drive and confirm there is no hesitation under acceleration.
• Recheck that every coil connector is fully clicked in if you feel a misfire.

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💰 DIY vs Shop Cost

Shop Cost: ₹12,000-₹28,000 (parts + labor)

DIY Cost: ₹8,000-₹22,000 (parts only)

You Save: ₹4,000-₹6,000 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

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🎯 Ready to get started?

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