Possible Causes
| Possible Causes |
|---|
| (K904) O2 SENSOR 2/2 RETURN CIRCUIT SHORTED TO GROUND |
| (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT SHORTED TO GROUND |
| (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 SENSOR 2/2 RETURN CIRCUIT |
| (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT SHORTED TO THE (Z902) O2 SENSOR 2/2 HEATER GROUND CIRCUIT |
| O2 SENSOR 2/2 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .