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That would depend on the engine choice of the 2007 Highlander. The 4 cylinder model has a maintenance-free timing chain while the V6 model has a timing belt. The redesigned 2008s all have a timing chain however.
The 2007 model has a timing chain instead of a timing belt.
Does a 2007 Nissan Sentra have a timing belt or timing chain?
belt
It has no timing belt, they use timing chain
It has no timing belt, they use timing chain
Does not have a belt but a timing chain in 2007.
Timing Chain
timing CHAIN
it has a timing belt
Chain
It uses a timing chain.