Possible Causes
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. 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 SHORTED TO GROUND |
| EXCESSIVE RESISTANCE IN THE (K99) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .