Factory recommendation to change the spark plugs on a 2000 Toyota Avalon is 120.000 miles.
The 2000 Toyota Avalon spark plugs can be located on each side of the engine. The spark plugs will be near the bottom of the engine. There are three spark plugs on each side.
under the hood
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Open the hood and you will fidn them. DO not think they are in the trunk :)
Below the Ignition coils on top of the engine.
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Under the hood of the 1995 Toyota Avalon, along each side of the engine block are the spark plugs. Make sure the engine is cool before starting. Remove the wires covering the spark plugs, which lead from the distributor cap. Use a socket wrench to remove the spark plugs. Take out the new spark plugs from each of the six boxes, use the gap tool to set the gap at .034 and screw the new plugs in. Use the socket wrench to tighten the spark plugs and put the wires back in place.