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they are installed through tubes in the tops of both cylinder heads. to access the front ones, remove the trim shield from the top of the engine, remove the 3 electrical plugs then the 3 bolts from the coil assemblies. remove the coils by twisting then tugging gently. you can then see the spark plugs in the holes that the coils just came out of. to get to the rear ones, the cowl containing the wiper motor needs to be removed. and to make the job easier, i always remove the throttle body from the intake. this allows easy access to the #3 and #5 spark plugs under the intake.

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Q: Where are the spark plugs located on 2005 sienna?
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