Possible Causes
WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| (K99) O2 1/1 HEATER SUPPLY CIRCUIT OPEN/HIGH RESISTANCE |
| (K79) O2 1/1 HEATER RETURN CIRCUIT OPEN/HIGH RESISTANCE |
| O2 SENSOR MODULE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L .
NOTE:
Before replacing O2 Sensor or O2 Sensor Module, check aftertreatment wiring harness for spread terminals. For wiring harness checking procedure, DO NOT back probe, use Electric Terminal Tool Kit (special tool #8197A, Electric Terminal Tool Kit).