How many oxygen sensors on ford 2003 4.0 sport trac?

The 2003 Ford Explorer Sport Trac with a 4.0L V6 engine typically has four oxygen sensors: two upstream (pre-catalytic converter) and two downstream (post-catalytic converter). These sensors monitor the oxygen levels in the exhaust to help optimize fuel efficiency and emissions. However, it's always a good idea to consult the vehicle's service manual for specific details or variations.