2 upstream and 2 downstream for a total of 4 O2 sensors.
The 2002 Hyundai Santa-FE has 16 valves.
The 2002 Hyundai Santa-FE's engine produces 138 hp @ 5500 rpm.
The gas tank on the 2002 Hyundai Santa-FE holds 17.2 gal..
As far as I know, there are 4 oxygen sensors on a 2001 Hyundai Santa Fe. 1 upstream sensor and 1 downstream sensor located in the front manifold/exhaust and 1 upstream and 1 downstream sensor located in the rear manifold/exhaust.
The 2006 Hyundai Santa-FE has 24 valves.
The 2012 Hyundai Santa-FE has 16 valves.
The 2008 Hyundai Santa-FE has 24 valves.
The 2014 Hyundai Santa-FE has 24 valves.
The 2011 Hyundai Santa-FE has 16 valves.
The 2007 Hyundai Santa-FE has 24 valves.
The 2004 Hyundai Santa-FE has 16 valves.
The 2010 Hyundai Santa-FE has 16 valves.