120000 miles with original iridium plugs.
Around $170.00
Now would be a good time to do a tuneup.
To change the spark plugs in a 2008 Highlander Sport, first, ensure the engine is cool and disconnect the negative battery cable. Remove the engine cover if necessary, then locate the spark plug wires or coils and carefully disconnect them. Use a spark plug socket and ratchet to remove the old spark plugs, then install the new plugs, ensuring they are properly gapped and torqued to the manufacturer’s specifications. Reconnect the spark plug wires or coils, and reattach the battery cable.
when do you change spark plugs
For a 2001 Toyota Highlander, it's generally recommended to change the spark plugs every 30,000 to 100,000 miles, depending on the type of spark plugs used. If you're using standard copper spark plugs, aim for around 30,000 miles, while iridium or platinum plugs can last up to 100,000 miles. Always consult your owner’s manual for specific recommendations related to your vehicle's engine type and driving conditions. Regular maintenance checks can help determine the optimal replacement interval.
To change the spark plugs on a 2009 Toyota Highlander, first, ensure the engine is cool and disconnect the battery. Remove the engine cover if necessary, then locate the spark plug wires or ignition coils and carefully disconnect them. Use a socket wrench to remove the old spark plugs, inspect the new plugs for the correct gap, and install them by hand before tightening them securely. Reconnect the ignition coils or wires and the battery, and check for any issues before starting the engine.
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