how to replace the spark plugs in my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock or short circuits.

2. Remove Engine Cover (if applicable)

• Use a socket set to remove any bolts securing the engine cover.
• Gently lift off the engine cover and set it aside.

3. Access Spark Plugs

• Locate the ignition coils on top of the spark plugs.
• Disconnect the electrical connectors from each ignition coil by pressing the tab and pulling it out.
• Remove the bolts securing each ignition coil using a socket wrench.
• Gently pull each ignition coil out of the spark plug well.

4. Remove Old Spark Plugs

• Use a spark plug socket and ratchet to carefully unscrew and remove the old spark plugs from the cylinder head.
• Inspect the removed spark plugs for signs of wear or damage.

5. Install New Spark Plugs

• Check and adjust the gap on the new spark plugs using a feeler gauge (refer to manufacturer's specifications, typically around 0.043 inches).
• Apply a small amount of anti-seize compound to the threads of the new spark plugs (optional).
• Hand-tighten the new spark plugs into the cylinder head, then use a torque wrench to tighten them to the specified torque (typically around 13 lb-ft).

6. Reinstall Ignition Coils

• Carefully insert each ignition coil back into its respective spark plug well.
• Secure the ignition coils with their bolts and reconnect the electrical connectors.

7. Replace Engine Cover

• Reinstall the engine cover, if removed, and secure it with the appropriate bolts.

8. Reconnect Battery

• Reconnect the negative battery terminal and ensure it is secure.