How Often Should the Highlander's Spark Plugs Be Replaced?

[VanJade]

Under normal circumstances, the spark plugs of a Toyota Highlander have a service life of no more than 30,000 kilometers. Additionally, you can determine whether early replacement is necessary based on the symptoms of spark plug failure. Damaged spark plugs may exhibit the following conditions: difficulty starting, reduced power, excessive exhaust emissions, and increased fuel consumption. Steps for replacing spark plugs: Open the hood, lift the plastic engine cover, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for external debris such as leaves or dust and ensure everything is cleaned thoroughly. Place the new spark plugs into the spark plug holes, hand-tighten them a few turns, and then use the socket to tighten them further. Reinstall the removed high-voltage distributor wires in the correct firing order, then secure the cover back in place.