Possible Causes
| Possible Causes |
|---|
| O2 1/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .
| Possible Causes |
|---|
| O2 1/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .