🔧 Prius V - Ignition Coil Replacement

The ignition coils sit on top of the engine and fire each spark plug. Replacing a bad coil can fix misfires, rough idle, flashing check engine light, and poor fuel economy.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

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⚠️ Safety & Precautions

• The hybrid system still has high voltage elsewhere in the vehicle, but the ignition coils are on the 12V engine side only.
• Make sure the car is fully OFF and the key/fob is away from the vehicle.
• Let the engine cool down before starting. Coils and the valve cover area can get hot.
• Disconnect the negative 12V battery terminal if you want extra safety and to reduce the chance of setting a fault code while unplugging connectors.
• Do not force the coil connectors. The plastic tabs can break easily.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4-inch ratchet
• 1/4-inch extension
• Torque wrench (inch-pound)
• Small flat trim tool
• 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.
• Turn the vehicle fully OFF.
• Open the hood and let the engine cool if it was recently running.
• If you disconnect the 12V battery, save radio and window settings first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use your hands to lift the plastic engine cover straight up and off.
• Set it aside in a safe place.

Step 2: Disconnect the ignition coil connector

• Find the coil you want to replace on top of the engine.
• Use a small flat trim tool to gently release the connector tab if needed.
• Pull the connector straight off the coil.
• Do not pull on the wires.

Step 3: Remove the coil hold-down bolt

• Use a 10mm socket and 1/4-inch ratchet to remove the coil retaining bolt.
• Keep the bolt in a safe place.
• Torque on installation: 7.5 Nm (66 in-lbs)

Step 4: Remove the ignition coil

• Twist the coil slightly by hand to break it loose.
• Pull the coil straight up and out of the spark plug tube.
• If it sticks, use a gentle side-to-side motion. Do not pry hard.

Step 5: Install the new ignition coil

• Compare the new coil to the old one before installing.
• Push the new coil straight down into place until fully seated.
• Install the 10mm hold-down bolt by hand first.
• Use the 10mm socket and torque wrench (inch-pound) to tighten it to 7.5 Nm (66 in-lbs).

Step 6: Reconnect the electrical connector

• Push the connector onto the new coil until it clicks.
• Gently tug once to make sure it is locked.

Step 7: Reinstall the engine cover

• Set the cover back in place.
• Press down evenly until it snaps into position.

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✅ After Repair

• Start the vehicle and let it idle.
• Make sure the check engine light is off.
• If the misfire was caused by a bad coil, the engine should run smoother right away.
• If the light stays on, clear codes with a scan tool and recheck for other misfire causes like spark plugs or wiring.

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💰 DIY vs Shop Cost

Shop Cost: $280-$520 (parts + labor)

DIY Cost: $120-$280 (parts only)

You Save: $160-$240 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1 hour.

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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.