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Discussion Starter · #1 ·
Will be undertaking replacement (front and rear) of my valve covers gaskets (both are leaking) -- I am wondering what else is opportunistically convenient and smart to service while I am in there. Knock sensors? Spark plugs were replaced at 100K (it's at 137K currently). Thanks.
 

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What year, which engine?

If it’s the earlier 3MZ-FE V6, replace the PCV valve and grommet in the rear cover. The knock sensors are under the intake manifold, which would be a deeper dive. There’s also a coolant bypass hose under the manifold that would be good to replace.

If it’s the later 2GR-FE, I don’t know much about that engine.
 

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Yeah, according to the wiki article on the Sienna, it got the later V6 in 2007.
 
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