Possible Causes
| Possible Causes |
| INTERMITTENT DTC |
| (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z907) GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| 1/1 OXYGEN SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Perform *PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE
.