850 R L5-2.3L Turbo VIN 53 B5234T3 (1997)
Oxygen Sensor: Locations
HEATED OXYGEN SENSORS (HO2S) FRONT AND REAR:
Bank 1, Sensor 1 (Heated Oxygen Sensor, Front) is located before the catalytic converter.
Bank 1, Sensor 2 (Heated Oxygen Sensor, Rear) is located after the catalytic converter.