Possible Causes
| Possible Causes |
|---|
| INTAKE SYSTEM LEAK OR RESTRICTION |
| EXHAUST SYSTEM LEAK OR RESTRICTION |
| POOR EGR SYSTEM PERFORMANCE |
| POOR FUEL SYSTEM PERFORMANCE |
| OXYGEN SENSOR |
| ENGINE CONTROL MODULE (ECM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .