Possible Causes
| Possible Causes |
|---|
| EXHAUST LEAK |
| CONTAMINANTS ON THE O2 SENSOR |
| O2 SENSOR 1/2 SIGNAL CIRCUIT |
| O2 SENSOR RETURN CIRCUIT |
| O2 SENSOR |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .