Possible Causes
| Possible Causes |
|---|
| O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| O2 SENSOR 1/1 RETURN CIRCUIT SHORTED TO VOLTAGE |
| O2 SENSOR 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO VOLTAGE |
| O2 SENSOR 1/1 PUMP CELL CURRENT ADJUST CIRCUIT SHORTED TO VOLTAGE |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .