Oxygen Sensor: Locations

O2 Sensors - Location

HO2S identification is as follows:
- Upstream HO2S on #1 cylinder bank: HO2S 1/1
- Upstream HO2S on opposite bank: HO2S 2/1
- Downstream HO2S: HO2S 1/2

NOTE: No interchangeability between upstream HO2S (green connector) and downstream HO2S (blue connector).