Possible Causes
| Possible Causes |
|---|
| EXHAUST LEAK |
| OXYGEN SENSOR WIRING OR CONNECTORS |
| O2 SENSOR SIGNAL CIRCUIT |
| O2 SENSOR RETURN CIRCUIT |
| OXYGEN SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .