Whether your 2007 has the standard 2.4L I4 or the optional 3.5L V6 it is chain driven. Take great care to keep up with the coolant service if it is the V6, though. I expect like the US Sienna that had the 3.5L V6 starting in 2007, if the water pump has to be changed the engine and transaxle have to be removed to access the pump. That is every bit as expensive as it sounds.
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