How many kilometers should the spark plugs of the Highlander be replaced?

[LeDominic]

Under normal circumstances, the service life of the spark plugs for the Toyota Highlander does not exceed 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 cover of the engine, remove the high-voltage distributor wires, and mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris such as 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. Install the removed high-voltage distributor wires in the firing order and secure the cover.