Possible Causes
| Possible Causes |
|---|
| EXCESSIVE FUEL PRESSURE OR POOR FUEL QUALITY/CONTAMINATION |
| FUEL INJECTOR LEAKING INTO ENGINE |
| LEAKING PURGE SOLENOID |
| ENGINE MECHANICAL - INTAKE SYSTEM RESTRICTED |
| EXHAUST SYSTEM RESTRICTION |
| EGR VALVE INTERNAL LEAK |
| FAULTY MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR READING |
| O2 SENSOR WIRING ISSUE |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .