96 is obd2 in north america, so there are 4. bank1 (cyls 1-3) sensor 1 (pre-cat), bank2 (cyls 4-6) sensor 1 (also pre-cat), and bank1 sensor2 (post cat), as well as bank2 sensor2.
the sensor2's are only there to check the cat performance, and will not affect the way the car runs. at all. period amen.
hope this helps.