Possible Causes
WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| O2 SENSOR 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE |
| O2 SENSOR 1/1 HEATER CONTROL CIRCUIT OPEN/HIGH RESISTANCE |
| O2 SENSOR GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| OXYGEN SENSOR 1/1 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to: 2.0L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .