Possible Causes
| Possible Causes |
|---|
| EXHAUST SYSTEM LEAK |
| O2 SENSOR 1/2 SIGNAL CIRCUIT |
| O2 SENSOR 1/2 RETURN CIRCUIT |
| O2 SENSOR 1/2 |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to: PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .