Sienna AWD V6-3.3L (3MZ-FE) (2004)
Spark Plug: Service and Repair
Removal
Toyota does not provide any specific service and repair procedures for the spark plugs.
NOTE:The ignition for the Sienna is a coil-on-plug (COP) system. There are three coils on each bank, and under each ignition coil is a spark plug.
Removal of the plugs near the firewall may require removal of the FR cowl top assembly and/or V-bank cover first.