Possible Causes
| Possible Causes |
|---|
| INTERMITTENT DTC |
| (K399) O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE |
| (K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z902) GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| 2/2 O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.