Possible Causes
WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| (K99) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT OPEN |
| O2 SENSOR 1/1 HEATER GROUND CIRCUIT OPEN |
| O2 SENSOR 1/1 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .