Diagnostic test indicates bank 2 O2 sensor 1 is slow where is the sensor on a 1998 ford explorer 40 SOHC located?

As I understand it, Bank 2 should indicate driver side, and sensor 1 should be the sensor closest to the front of the car, upstream of the catalytic converter. The safest way to find out for sure, is to find an honest Ford service technician and ask! Good luck