Depends. Are you doing the work yourself? If so the belt itself is around $35.00 or so.
If your going to get someone else to do it , it might be around 4-500 dollars to around $1000, depends on who does it and what else they want to replace, at the same time, such as the water pump, idler and tensioner bearings. At any rate it is a several hour labor job.
You don't as it has a chain not a belt.
It has a belt. Replace it every 90,000 miles.
The 3.3 liter V6 in a 2007 Toyota Highlander has a timing BELT
Factory recommendation is 90,000 miles.
Factory recommended at 90,000 miles.
I have a 2006 Toyota highlander hybrid, do I need to change timing belt or chain?
Timing belt
Belt
The 3.3 litre V6 engine in a 2005 Toyota Highlander has a timing BELT
The 3.3 liter V6 engine in a 2006 Toyota Highlander has a timing BELT
In 2008 the Toyota Highlander V-6 engine was equipped with a timing CHAIN.
The manual states at 90,000 miles.Factory recommends 90,000 miles.