How often should the spark plugs of a Highlander be replaced?

[EvelynMarie]

Under normal circumstances, the service life of the spark plugs in a Toyota Highlander does not exceed 30,000 kilometers. Additionally, whether they need to be replaced early can be determined 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 cover of the engine, 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 any external debris like leaves or dust and ensure they are thoroughly cleaned. 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 according to the firing order, and then secure the cover plate.