Possible Causes
| Possible Causes |
|---|
| EXHAUST LEAK |
| (K99) O2 SENSOR 1/1 SIGNAL CIRCUIT |
| (K902) O2 SENSOR 1/1 RETURN CIRCUIT |
| O2 SENSOR 1/1 |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .