Possible Causes
| Possible Causes |
|---|
| EXHAUST LEAK |
| O2 SENSOR 1/1 SIGNAL CIRCUIT |
| O2 SENSOR 1/1 RETURN CIRCUIT |
| OXYGEN (O2) SENSOR 1/1 |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .