July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Oxygen Sensor: Locations

Powertrain Component Views

Rear of the Engine (4.3L/5.3L)

1 - Heated Oxygen Sensor (HO2S) - Bank 1 Sensor 1
2 - Heated Oxygen Sensor (HO2S) - Bank 2 Sensor 1
3 - Heated Oxygen Sensor (HO2S) - Bank 2 Sensor 2
4 - Heated Oxygen Sensor (HO2S) - Bank 1 Sensor 2
5 - Park/Neutral Position (PNP) Switch