This procedure replaces the ignition coils on a 2018-2024 Toyota Camry 2.5L I4 engine. Note: This engine uses a coil-on-plug ignition system and does not have traditional spark plug wires.

Warnings

Tools required

Parts

• Spark plugs (4) × 4 — 90919-01276 or NGK LKAR8A-9
• Ignition coils (if replacing) × 4 — 90919-02267

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level surface and engage parking brake
3. Turn ignition to OFF position and remove key
4. Open hood and secure with prop rod
5. Disconnect negative battery terminal and wait 3 minutes for capacitors to discharge

Procedure

1. 1

   Remove engine cover
   Grasp the engine cover firmly and pull upward to release the plastic clips. The cover is held by push-clips only and does not require tools. Set aside in a clean area.
2. 2

   Disconnect ignition coil electrical connectors
   Locate all four ignition coils positioned directly on top of the spark plugs. Press the release tab on each coil electrical connector and pull straight up to disconnect. Mark or remember the cylinder position if coils are being reused.
3. 3

   Remove ignition coil bolts
   Using a 10mm socket, remove the single bolt securing each ignition coil. Store bolts in a clean container to prevent loss. Note that cylinders 1 and 4 may have slightly restricted access.
   Torque spec

   Ignition Coil Bolt11 Nm (8 lb-ft)
4. 4

   Extract ignition coils
   Firmly grasp each ignition coil and pull straight up with a twisting motion to break the seal. The coil boot may stick to the spark plug due to heat cycling. Do not pry against the coil body as this can crack it. Inspect coil boots for cracks, carbon tracking, or oil contamination.
5. 5

   Clean spark plug wells
   Use compressed air or a shop vacuum to remove any debris, dirt, or oil from the spark plug wells. This is critical to prevent contamination from falling into the cylinders when spark plugs are removed. Inspect for oil accumulation which may indicate valve cover gasket failure.
   ⚠Do not allow debris to fall into the cylinder when spark plugs are removed. Foreign material can cause catastrophic engine damage.
6. 6

   Remove spark plugs
   Using a spark plug socket with extension, carefully loosen each spark plug by turning counterclockwise. Once loose, unthread by hand to prevent cross-threading. Remove all four spark plugs and inspect electrodes for wear, carbon buildup, or unusual deposits. Normal electrodes should be light tan to gray.
7. 7

   Gap and prepare new spark plugs
   Verify the spark plug gap on all new plugs using a gap tool. Correct gap is 0.043 inches (1.1mm). Apply a small amount of anti-seize compound to the threads only, avoiding the electrode end. Do not over-apply as excess can foul the plug or enter the combustion chamber.
   ⚠Never use anti-seize on the electrode end of the spark plug. Keep anti-seize away from the center electrode and insulator.
   Torque spec

   Spark Plug20 Nm (15 lb-ft)
8. 8

   Install new spark plugs
   Thread each spark plug by hand into the cylinder head, turning clockwise. Thread at least 3-4 full turns by hand to ensure proper seating and prevent cross-threading. Once hand-tight, use the torque wrench and spark plug socket to tighten to specification. Work in sequence from cylinder 1 to 4.
   Torque spec

   Spark Plug20 Nm (15 lb-ft)
9. 9

   Prepare ignition coils for installation
   Apply a thin coat of dielectric grease to the inside of each coil boot where it contacts the spark plug. This prevents moisture intrusion and makes future removal easier. Inspect coil boots for any cracks or damage before installation.
10. 10

    Install ignition coils
    Align each ignition coil with its corresponding spark plug and push down firmly until the coil seats fully on the valve cover. The boot should engage the spark plug terminal completely. Install the 10mm mounting bolt for each coil and tighten to specification using the torque wrench.
    Torque spec

    Ignition Coil Bolt11 Nm (8 lb-ft)
11. 11

    Reconnect electrical connectors
    Push each ignition coil electrical connector onto its corresponding coil until you hear and feel a positive click. Gently tug on each connector to verify it is fully seated and locked in place.
12. 12

    Reinstall engine cover and reconnect battery
    Align the engine cover with the mounting clips on the valve cover and push down firmly until all clips engage with an audible snap. Reconnect the negative battery terminal. Clear any diagnostic trouble codes if a scan tool is available.

Reassembly

1. Ensure all four ignition coil connectors are fully seated and locked
2. Verify engine cover is properly clipped in place with no gaps
3. Double-check that no tools or parts were left in the engine bay

Verification

• Start the engine and verify it starts smoothly without misfires or rough idle
• Listen for any unusual sounds such as ticking or arcing noises from the ignition system
• Allow engine to reach operating temperature and verify smooth acceleration with no hesitation
• Check for diagnostic trouble codes using an OBD-II scanner if available
• Test drive vehicle to confirm normal engine performance under load

More procedures for this vehicle