Possible Causes
| Possible Causes |
|---|
| (K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO GROUND |
| (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND |
| (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO (K904) O2 DOWNSTREAM RETURN CIRCUIT |
| (K141) O2 1/2 SIGNAL SHORTED TO THE (Z902) O2 1/2 HEATER GROUND CIRCUIT |
| O2 SENSOR |
| PCM |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.