🔧 Odyssey - Ignition Coil Replacement

Your Odyssey has one ignition coil per cylinder (6 total). Replacing a weak coil helps fix misfires, rough running, flashing check-engine lights, and poor acceleration.

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

Assumption: Rear coils are accessed by removing the cowl; some vans may also need the upper intake removed.

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Do not pull on wiring; press the connector lock tab first.
• ⚠️ If the check-engine light is flashing, avoid driving until repaired (can damage the catalytic converter).

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" ratchet
• 3/8" torque wrench (5–60 Nm range)
• 3" socket extension
• 6" socket extension
• Universal swivel joint adapter
• Phillips screwdriver
• Trim clip removal tool
• Needle-nose pliers
• Magnetic pickup tool
• OBD2 scan tool (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coils - Qty: 6
• Dielectric grease packet - Qty: 1
• Upper intake manifold gasket set - Qty: 1 (only if upper intake is removed)

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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 fully cool.
• Use a 10mm socket to disconnect the negative battery cable and tuck it aside.
• If you have a misfire code, use an OBD2 scan tool (specialty) to save codes for reference before clearing anything.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Lift the plastic engine cover upward to release it from the rubber grommets (use your hands).
• Set it aside where it won’t get stepped on.

Step 2: Replace the front-bank ignition coils (easiest side)

• Locate the three coils on the front cylinder head (closest to the radiator).
• Press the electrical connector lock tab and unplug the coil connector.
• Use a 10mm socket with a 3/8" ratchet to remove the coil hold-down bolt.
• Twist the coil slightly, then pull it straight up to remove it.
• Put a small smear of dielectric grease inside the new coil boot (the rubber end that seals to the spark plug).
• Install the new coil straight down until fully seated.
• Reinstall the hold-down bolt and Torque to 12 Nm (9 ft-lbs) using a 3/8" torque wrench.
• Plug the connector back in until it clicks.
• Repeat for the other two front-bank coils.

Step 3: Create space to reach the rear-bank ignition coils (cowl removal)

• Remove the rubber hood-to-cowl seal by pulling it upward (use your hands).
• Use a trim clip removal tool to pop out the plastic clips along the cowl panel.
• Remove any Phillips screws (if present) using a Phillips screwdriver.
• Remove the wiper arms:
  • Flip up the caps at the wiper-arm nuts.
  • Use a 14mm socket to remove the nuts.
  • Wiggle each wiper arm upward to release it from the splines, then lift it off.
• Lift off the plastic cowl panel(s).
• If you need more room, remove the wiper motor/linkage tray:
  • Unplug connectors as needed by pressing their lock tabs.
  • Use a 10mm socket to remove tray bolts, then lift the tray out.
• Tip: Put clips/bolts in labeled cups.

Step 4: Replace the rear-bank ignition coils

• Locate the three coils on the rear cylinder head (closest to the firewall).
• Unplug each coil connector (press the lock tab first).
• Use a 10mm socket with a 6" socket extension and universal swivel joint adapter (a pivoting connector that helps reach angled bolts) to remove each coil hold-down bolt.
• Pull each coil straight up and out. If it’s stuck, gently twist while pulling.
• Add a small smear of dielectric grease inside the new coil boot.
• Install each new coil fully seated.
• Reinstall the hold-down bolt and Torque to 12 Nm (9 ft-lbs) using a 3/8" torque wrench.
• Reconnect each electrical connector until it clicks.
• Tip: Don’t overtighten coil bolts.

Step 5: If rear access is still too tight (alternate path: upper intake removal)

• Only do this if you cannot physically remove/install the rear coils after cowl removal.
• Use needle-nose pliers to release hose clamps and move hoses off the upper intake as needed.
• Unplug any intake electrical connectors by pressing their lock tabs.
• Use a 12mm socket with a 3/8" ratchet to remove the upper intake fasteners, then lift the upper intake off.
• Replace the upper intake manifold gaskets with the new set before reinstalling.
• Reinstall the upper intake fasteners evenly (snug them in steps using a 12mm socket).
• Tip: Cover open ports with a clean rag.

Step 6: Reinstall the cowl and wipers

• Reinstall the wiper tray (if removed) using a 10mm socket, and reconnect any unplugged connectors.
• Reinstall the plastic cowl panel(s) and clips using a trim clip removal tool.
• Reinstall the wiper arms:
  • Set arms on their splines in the same parked position.
  • Install nuts with a 14mm socket and Torque to 26 Nm (19 ft-lbs).
  • Close the nut caps.
• Reinstall the rubber hood-to-cowl seal by pressing it back into place.

Step 7: Reconnect the battery

• Reconnect the negative battery cable using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth.
• Use an OBD2 scan tool (specialty) to clear any misfire codes and confirm they don’t return.
• Test drive for 10–15 minutes with gentle acceleration, then recheck for warning lights.
• Listen for a ticking/air-hiss near the intake area (could indicate a loose hose or intake gasket issue if the upper intake was removed).

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💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $180-$480 (parts only)

You Save: $270-$420 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?

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.