1999 Mazda Truck check engine light on

See below

Heated Oxygen Sensor (HO2S) No. 1 (2.5L)On right side of engine, in exhaust.
Heated Oxygen Sensor (HO2S) No. 1 (3.0L)On rear of engine, in exhaust.
Heated Oxygen Sensor (HO2S) No. 1 (4.0L)On right rear of engine, in exhaust.
Heated Oxygen Sensor (HO2S) No. 2 (2.5L)On lower rear center of engine compartment, in exhaust.
Heated Oxygen Sensor (HO2S) No. 2 (3.0L)On lower rear center of engine compartment, in exhaust.
Heated Oxygen Sensor (HO2S) No. 2 (4.0L)On lower rear center of engine compartment, in exhaust.
Heated Oxygen Sensor (HO2S) No. 3 (3.0L)On underside of vehicle, in exhaust, near transmission.
Heated Oxygen Sensor (HO2S) No. 3 (4.0L)On underside of vehicle, in exhaust, near transmission