🔧 Renegade - Ignition Coil Replacement

Ignition coils create the high voltage needed to fire the spark plugs. When a coil gets weak or fails, your Renegade can misfire, run rough, and trigger a flashing check engine light. Replacing coils is a straightforward under-hood job with basic hand tools.

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

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully; coils sit on a hot cylinder head.
• ⚠️ If the check engine light is flashing, avoid driving; it can damage the catalytic converter.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Pull coils straight up; twisting too hard can tear the rubber boot.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 6" extension (1/4" drive)
• Torque wrench (inch-pound or low-range Nm)
• Trim clip tool
• Small flathead screwdriver
• Nitrile gloves
• Safety glasses
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-4 Replace all four if high mileage
• Dielectric grease - Qty: 1
• Spark plug set - Qty: 1 Optional but recommended if due

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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 to the touch.
• Use a 10mm socket to disconnect the negative battery terminal and isolate it so it can’t spring back.
• If you’re chasing a misfire, note which cylinder is misfiring (example: P0302 = cylinder 2). This helps you swap just one coil or test by moving coils.

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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 and your hands to lift the cover straight up from its rubber grommets.
• Set it aside where it won’t get stepped on.

Step 2: Locate the ignition coils

• On the 1.4L engine, each coil sits directly on top of a spark plug along the top of the engine.
• One coil per cylinder

Step 3: Unplug the coil electrical connector

• Use a small flathead screwdriver to gently lift the locking tab if it’s tight.
• Press the release and pull the connector straight off (don’t pull on the wires).

Step 4: Remove the coil retaining bolt

• Use a 10mm socket, 1/4" ratchet, and 6" extension to remove the bolt holding the coil to the valve cover.
• Put the bolt somewhere safe; it’s easy to drop.

Step 5: Remove the ignition coil

• Grip the coil body and pull straight upward.
• If it’s stuck, gently wiggle while pulling up—avoid prying hard on plastic.
• The rubber boot seals tight

Step 6: Prep and install the new coil

• Put a very small dab of dielectric grease inside the tip of the new coil boot.
• Push the new coil straight down until you feel it fully seat 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 to tighten the coil bolt: Torque to 8 Nm (71 in-lbs).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks/locks.
• Gently tug to confirm it’s secure.

Step 9: Repeat for any other coils

• If replacing all coils, repeat Steps 3-8 for each cylinder.
• If diagnosing a misfire, you can swap a suspected coil to another cylinder and see if the misfire “follows.”

Step 10: Reinstall the engine cover and reconnect the battery

• Press the engine cover back onto its grommets by hand.
• Use a 10mm socket to reconnect 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.
• If you had a check engine light, clear codes with a scan tool if available; otherwise it may clear after a few drive cycles if the fault is gone.
• Test drive 10-15 minutes and recheck for warning lights.
• If misfire remains, the issue may be a spark plug, injector, vacuum leak, or wiring at that coil connector.

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💰 DIY vs Shop Cost

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

DIY Cost: $60-$320 (parts only)

You Save: $190-$330 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.7-1.2 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.