Possible Causes
| POSSIBLE CAUSES |
|---|
| (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (K904) O2 1/2 RETURN CIRCUIT SHORTED TO VOLTAGE |
| (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (K299) O2 1/2 HEATER CONTROL CIRCUIT |
| (K141) O2 1/2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE |
| (K904) O2 1/2 RETURN CIRCUIT OPEN OR HIGH RESISTANCE |
| OXYGEN SENSOR 1/2 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .