Possible Causes
| Possible Causes |
|---|
| (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z916) GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| OXYGEN SENSOR 1/1 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.