Possible Causes
| Possible Causes |
|---|
| O2 SENSOR HEATER OPERATION |
| EVAP PURGE SOLENOID OPERATION |
| O2 SIGNAL CIRCUIT |
| O2 RETURN CIRCUIT |
| O2 SENSOR |
| MAP SENSOR |
| ECT SENSOR |
| ENGINE MECHANICAL PROBLEM |
| FUEL FILTER/PRESSURE REGULATOR (HIGH) |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .