Possible Causes
| Possible Causes |
|---|
| (K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND |
| (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO GROUND |
| (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO (K902) O2 RETURN UPSTREAM CIRCUIT |
| (K41) O2 1/1 SIGNAL SHORTED TO THE (Z902) O2 1/1 HEATER GROUND CIRCUIT |
| O2 SENSOR |
| PCM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .