🔧 Wrangler - Ignition Coil Replacement

Your Wrangler uses one ignition coil per cylinder (6 total). Replacing a bad coil can fix misfires, rough idle, flashing check engine light, and poor acceleration.

Difficulty Level: Beginner | Estimated Time: 0.5-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep tools and hands away from the radiator fan area.
• ⚠️ If you disconnect the battery, you may lose radio presets.
• ⚠️ Don’t pull on wires—always pull on the connector body.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3"-6" socket extension
• Torque wrench (inch-pound)
• Trim clip tool
• Flathead screwdriver (small)
• 10mm wrench
• 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
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Let the engine cool fully.
• If you want the safest approach, disconnect the battery: use a 10mm wrench to remove the negative terminal and tuck it aside so it can’t spring back.
• Tip: Replace one coil at a time to avoid mix-ups.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a trim clip tool to gently pop up any push clips if present.
• Lift the cover straight up by hand to release it from the rubber grommets.

Step 2: Locate the coil you’re replacing

• Each coil sits on top of a spark plug and has an electrical connector.
• If you’re chasing a misfire code (like P0302), match the cylinder number to the coil before removing anything.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab by hand.
• If it’s stubborn, use a small flathead screwdriver to gently help lift the lock (don’t pry hard).
• Tip: Wiggle the connector—don’t yank.

Step 4: Remove the coil mounting bolt

• Use a 10mm socket with a 3"-6" extension and 1/4" ratchet to remove the bolt.
• Set the bolt aside (you will typically reuse it).

Step 5: Remove the ignition coil

• Pull the coil straight upward while gently twisting by hand to break the seal of the rubber boot.
• Inspect the coil boot for oil or coolant contamination.

Step 6: Install the new coil

• Apply a tiny smear of dielectric grease inside the coil boot (this helps prevent sticking and moisture issues).
• Push the coil straight down until it fully seats on the spark plug.

Step 7: Reinstall and torque the coil bolt

• Thread the bolt in by hand first to avoid cross-threading.
• Use a torque wrench (inch-pound) with a 10mm socket to tighten the bolt: Torque to 71 in-lb (8 Nm).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks/locks.
• Give it a light tug to confirm it’s latched.

Step 9: Repeat for any other coils

• Use the same 10mm socket process and do them one at a time.
• Tip: If replacing all 6, keep bolts grouped.

Step 10: Reinstall the engine cover and reconnect battery (if removed)

• Press the engine cover back onto the grommets by hand.
• If disconnected, use a 10mm wrench to reinstall the negative battery terminal snugly.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smooth with no shaking.
• Road test for 10-15 minutes and confirm the check engine light stays off.
• If you have a code reader, clear stored misfire codes and recheck for returning codes.
• If the new coil still misfires, the spark plug or injector may be the cause.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor, depends how many coils)

DIY Cost: $35-$360 (parts only, depends how many coils)

You Save: $145-$90 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.5 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.