Upstream Oxygen Sensor 2/1 Connector End View
OXYGEN SENSOR 2/1 UPSTREAM - BLACK 4 WAY
| CAV | CIRCUIT | FUNCTION |
| 1 | 18RD/DG | FUSED ENGINE CONTROL RELAY OUTPUT |
| 2 | 18BR/BK (EXCEPT SRT) | OXYGEN SENSOR 2/1 HEATER CONTROL |
| 2 | 18BR/GY (SRT) | OXYGEN SENSOR 2/1 HEATER CONTROL |
| 3 | 20DG | SENSOR GROUND |
| 4 | 20BK (EXCEPT SRT) | OXYGEN SENSOR 2/1 SIGNAL |
| 4 | 20BK/BR (SRT) | OXYGEN SENSOR 2/1 SIGNAL |