🔧 CX-5 - Spark Plug Replacement

Replacing the spark plugs on your CX-5 helps prevent misfires, hard starting, and poor fuel economy. On the 2.0L engine, the plugs sit under the ignition coils on top of the engine, so access is straightforward once the engine cover is off.

Difficulty Level: Beginner | Estimated Time: 0.8-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burned hands and damaged threads.
• ⚠️ Keep dirt out of the spark plug holes; debris can damage the engine.
• ⚠️ Do not over-tighten spark plugs; aluminum cylinder head threads strip easily.
• ⚠️ Battery disconnect is not required, but disconnecting the negative terminal is safer if you’re nervous about electrical connectors.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive extension (6")
• 14mm spark plug socket
• 3/8" drive torque wrench (5-30 Nm range)
• Trim clip tool
• Compressed air blow gun
• Clean shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (iridium, correct spec for CX-5 2.0L) - Qty: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, put the shifter in neutral, and set the parking brake.
• Let the engine cool completely (at least 1 hour after driving).
• If disconnecting the battery: use a 10mm socket to remove the negative terminal and isolate it so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use a trim clip tool to gently lift the engine cover corners (it’s held by rubber grommets).
• Lift the cover straight up and set it aside on a clean shop towel.
• Pull straight up, don’t twist hard.

Step 2: Unplug the ignition coils

• Locate the four ignition coils on top of the engine (one per cylinder).
• Press the connector lock tab and pull the connector off each coil by hand.
• If a connector is stubborn, use a trim clip tool gently—don’t pry hard on the wires.
• Take a quick photo for reference.

Step 3: Remove the ignition coils

• Use a 10mm socket with a 3/8" drive ratchet to remove the bolt holding each coil.
• Pull each coil straight up to remove it.
• Set coils in order (cylinder 1-4) on a clean shop towel.
• Torque to 8 Nm (71 in-lbs) when reinstalling coil bolts.
• Twist slightly while pulling if stuck.

Step 4: Clean the spark plug wells

• Before removing any plug, blow out each spark plug well using a compressed air blow gun.
• This prevents dirt from falling into the cylinder when the plug comes out.

Step 5: Remove the old spark plugs

• Install a 14mm spark plug socket on a 3/8" drive extension (6") and 3/8" drive ratchet.
• Turn counterclockwise to loosen, then remove the plug fully.
• If a plug feels extremely tight, stop and re-check you’re fully seated on the plug hex.

Step 6: Install the new spark plugs (by hand first)

• Put the new plug into the 14mm spark plug socket (the socket rubber insert holds it).
• Thread the plug in by hand using only the 3/8" drive extension (6") (no ratchet at first).
• If it doesn’t thread smoothly, back it out and try again—this avoids cross-threading.
• Smooth threading is the goal.

Step 7: Torque the new spark plugs

• Use a 3/8" drive torque wrench (5-30 Nm range) with the 14mm spark plug socket to tighten each plug.
• Torque to 17 Nm (13 ft-lbs).
• Do not add anti-seize unless your plug manufacturer specifically requires it (it can cause over-tightening).

Step 8: Reinstall ignition coils

• Apply a tiny dab of dielectric grease inside each coil boot (it helps prevent moisture and makes future removal easier).
• Push each coil straight down until fully seated.
• Install coil bolts using a 10mm socket, then tighten with a 3/8" drive torque wrench.
• Torque to 8 Nm (71 in-lbs).

Step 9: Plug the coil connectors back in and reinstall the engine cover

• Push each electrical connector on until it clicks.
• Reinstall the engine cover by lining up the grommets and pressing down firmly by hand.
• If you disconnected the battery, reinstall the negative terminal using a 10mm socket and tighten snugly.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds. It should run smooth.
• Listen for a “ticking” or shake (signs a coil connector isn’t fully seated).
• Take a short test drive, then re-check that the engine cover is secure.
• If the check engine light comes on, stop and re-check coil connectors; a scan tool may be needed to read/clear codes.

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💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

DIY Cost: $45-$110 (parts only)

You Save: $175-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.2 hours.

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🎯 Ready to get started?

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