Possible Causes
WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| EXHAUST SYSTEM LEAK |
| ENGINE MECHANICAL/LOW CYLINDER COMPRESSION |
| UPSTREAM O2 SENSOR WIRING ISSUE |
| UPSTREAM O2 SENSOR |
| DOWNSTREAM O2 SENSOR WIRING ISSUE |
| DOWNSTREAM O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .