It is possible that a check engine light on a Toyota Highlander will come on if the coolant level is low. Usually, though, there is another light that will come on that says 'low coolant' on some older Toyota's.
Toyota Highlander was created in 2000.
The 2004 Toyota Highlander is 15'5" long.
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The 2002 Toyota Highlander has 16 valves.
The 2014 Toyota Highlander has 16 valves.
The 2010 Toyota Highlander has 16 valves.
The 2009 Toyota Highlander has 16 valves.
The 2012 Toyota Highlander has 16 valves.
The 2005 Toyota Highlander has 16 valves.
The 2007 Toyota Highlander has 16 valves.