🔧 Camry - Spark Plug Replacement

On your Camry, the spark plugs sit under the ignition coils on top of the engine. Replacing worn plugs helps prevent misfires, rough idle, and poor fuel economy, and it keeps the hybrid engine running smoothly.

Difficulty Level: Intermediate | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns and damaged threads.
• ⚠️ Make sure the car is OFF (not in READY) and keep the key/fob away from the car so it can’t turn on unexpectedly.
• ⚠️ Do not touch or probe any orange high-voltage wiring/connectors.
• ⚠️ Avoid dropping anything into the spark plug holes (it can damage the engine).
• Battery disconnect is not required for this job, but you must keep the car OFF.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 5/8" spark plug socket (16mm) with rubber insert
• 10mm socket
• Torque wrench (3/8" drive, 10-30 Nm range)
• Small flathead screwdriver
• Compressed air blow gun
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Iridium spark plugs (long-life, correct heat range) - Qty: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground and shift to Park.
• Turn the car OFF and confirm the dash is not showing READY.
• Let the engine cool completely (at least 30-60 minutes after driving).
• Set your torque wrench to the needed values ahead of time so you don’t forget.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Lift off the plastic engine cover using your hands (it’s held by rubber grommets).
• Use a flashlight to locate the four ignition coils on top of the valve cover.

Step 2: Unplug the ignition coil connectors

• At each coil, press the connector lock tab and pull the connector straight off.
• If a connector is stuck, use a small flathead screwdriver to gently help the tab release (don’t pry hard).
• Do one cylinder at a time.

Step 3: Remove the ignition coils

• Use a 10mm socket with a 3/8" drive ratchet to remove the coil hold-down bolt.
• Twist the coil slightly, then pull it straight up and out.
• Set the coil aside where it stays clean and dry.

Step 4: Clean around the spark plug wells

• Use compressed air blow gun to blow dirt/debris out of the spark plug well before removing the plug.
• This prevents grit from falling into the cylinder.

Step 5: Remove the old spark plug

• Install the 5/8" spark plug socket (16mm) with rubber insert onto a 3/8" drive extension (6") and your 3/8" drive ratchet.
• Turn counterclockwise to loosen, then remove the spark plug.
• If it feels extremely tight, stop and re-check that the engine is fully cool.

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

• Place the new spark plug into the 5/8" spark plug socket (16mm).
• Thread it in using only the extension and your fingers at first (no ratchet) to avoid cross-threading.
• Once it seats, use a torque wrench to tighten: Torque to 18 Nm (13 ft-lbs).
• Do not use anti-seize on the plug threads.

Step 7: Reinstall the ignition coil

• Put a very small smear of dielectric grease inside the rubber boot of the coil (dielectric grease helps prevent moisture and makes future removal easier).
• Push the coil straight down until fully seated on the spark plug.
• Install the hold-down bolt using a 10mm socket, then tighten with a torque wrench: Torque to 9 Nm (80 in-lbs).

Step 8: Plug the coil connector back in

• Push the connector on until it clicks.
• Repeat Steps 2-8 for the other 3 cylinders.

Step 9: Reinstall the engine cover

• Align the cover with the mounting points and press down firmly by hand until it snaps into place.

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✅ After Repair

• Start the car and confirm it idles smoothly (no shaking) and no warning lights appear.
• If you have a check engine light or rough running, re-check that every coil connector is fully clicked in.
• Take a short test drive and re-check for any abnormal hesitation.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $40-$120 (parts only)

You Save: $130-$410 by doing it yourself!

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