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To change the spark plugs on a 2007 Toyota Highlander, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the engine cover if present, then carefully detach the ignition coils from the spark plugs by unplugging the electrical connectors and removing the bolts. Use a spark plug socket to carefully unscrew the old spark plugs and replace them with new ones, ensuring they are properly gapped. Reassemble by reversing the process, reconnecting the ignition coils and battery terminal.

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5mo ago

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