Possible Causes
| Possible Causes |
|---|
| EXHAUST SYSTEM LEAK |
| ENGINE MECHANICAL CONDITION |
| AGING OR CONTAMINATED O2 SENSOR |
| O2 SENSOR WIRING AND CONNECTORS |
| CATALYTIC CONVERTER |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .