🔧 HR-V - Ignition Coil Replacement

Replacing the ignition coils on your HR-V is a straightforward engine-top repair. The ignition coils sit on top of the spark plugs and create the high voltage needed for combustion.

This repair is commonly done for misfires, rough idle, flashing check engine light, or codes like P0301, P0302, P0303, or P0304.

Difficulty Level: Beginner | Estimated Time: 30-60 minutes

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before starting.
• ⚠️ Disconnect the negative battery terminal before unplugging ignition coils.
• ⚠️ Do not pull on the coil wiring harness; pull only on the connector body.
• ⚠️ Replace coils one at a time so the cylinders do not get mixed up.
• ⚠️ If the check engine light is flashing, avoid driving until the misfire is repaired because catalytic converter damage can occur.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8-inch ratchet
• 3/8-inch extension 6-inch
• Torque wrench inch-pound range
• Trim clip removal tool
• Small flathead screwdriver
• Shop towel
• Dielectric grease applicator
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-4
• Dielectric grease - Qty: 1 small tube

Tip: If only one cylinder has a misfire code, you can replace only that coil. If mileage is high and coils are original, replacing all four is often more reliable.

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📋 Before You Begin

• Park your HR-V on level ground.
• Shift to Park and set the parking brake.
• Turn the ignition fully OFF and remove the key/fob from the vehicle area.
• Open the hood and let the engine cool.
• Disconnect the negative battery cable using a 10mm socket.
• A torque wrench is a tool that tightens bolts to an exact tightness so small engine bolts are not damaged.
• Dielectric grease is a non-conductive silicone grease used lightly inside the rubber coil boot to help prevent moisture and sticking.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the Hood and Disconnect the Battery

• Use the hood release inside the cabin, then raise and support the hood.
• Use a 10mm socket and 3/8-inch ratchet to loosen the negative battery terminal clamp.
• Move the negative cable aside so it cannot spring back onto the battery post.
• Keep metal tools off both battery posts.

Step 2: Remove the Engine Cover if Equipped

• If your HR-V has a plastic engine cover, lift it straight upward by hand.
• If any plastic clips are holding the cover or nearby harness, use a trim clip removal tool.
• Set the cover aside in a safe place.

Step 3: Locate the Ignition Coils

• The four ignition coils are lined up across the top of the engine.
• Each coil has one electrical connector and one small hold-down bolt.
• If replacing only one coil, match it to the misfire code: cylinder 1 is at the belt/passenger side of the engine, then cylinders 2, 3, and 4 continue across toward the driver side.
• Work on one coil at a time.

Step 4: Unplug the Ignition Coil Connector

• Press the locking tab on the coil connector with your finger.
• If the tab is stuck, gently use a small flathead screwdriver to help release it.
• Pull the connector straight back from the coil.
• Do not pry hard on old plastic connectors because they can crack.

Step 5: Remove the Coil Hold-Down Bolt

• Use a 10mm socket, 3/8-inch extension 6-inch, and 3/8-inch ratchet to remove the ignition coil hold-down bolt.
• Place the bolt somewhere safe so it does not fall into the engine bay.
• A magnetic tray helps prevent lost bolts.

Step 6: Remove the Old Ignition Coil

• Grip the top of the ignition coil by hand.
• Twist it gently left and right to loosen the rubber boot from the spark plug.
• Pull the coil straight upward out of the spark plug tube.
• Use a shop towel to wipe away dirt around the opening.
• Do not allow debris to fall into the spark plug tube.

Step 7: Prepare the New Ignition Coil

• Compare the new coil to the old coil by shape, connector style, and boot length.
• Use a dielectric grease applicator to apply a very thin film of dielectric grease inside the end of the rubber boot.
• Do not fill the boot with grease.
• A tiny amount is enough.

Step 8: Install the New Ignition Coil

• Slide the new coil straight down into the spark plug tube by hand.
• Press down firmly until the boot seats onto the spark plug.
• Install the hold-down bolt by hand first to avoid cross-threading.
• Use a 10mm socket, 3/8-inch extension 6-inch, and torque wrench inch-pound range to tighten the bolt.
• Torque to 12 Nm (9 ft-lbs / 106 in-lbs).

Step 9: Reconnect the Electrical Connector

• Push the ignition coil connector onto the new coil until it clicks.
• Gently tug the connector by hand to make sure it is locked.
• If replacing more coils, repeat Steps 4-9 for each remaining coil.

Step 10: Reinstall the Engine Cover and Battery Cable

• Reinstall the engine cover by pressing it straight down onto its mounts by hand.
• Reconnect the negative battery cable.
• Use a 10mm socket and 3/8-inch ratchet to tighten the negative battery terminal snugly.
• Do not overtighten the battery clamp.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes.
• The idle should be smooth with no shaking.
• If you disconnected the battery, the idle may relearn briefly; this is normal.
• If a check engine light was on, it may turn off after several drive cycles, or it can be cleared with a scan tool.
• Take a short test drive and confirm there is no hesitation, misfire, or flashing check engine light.
• If the same misfire returns after coil replacement, inspect the spark plug, fuel injector, wiring, and engine compression for that cylinder.

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💰 DIY vs Shop Cost

Shop Cost: $180-$650 depending on whether 1 coil or all 4 coils are replaced

DIY Cost: $45-$300 parts only

You Save: $135-$350 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

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