Possible Causes
| Possible Causes |
|---|
| (K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO VOLTAGE |
| (K43) O2 2/1 SIGNAL CIRCUIT OPEN |
| (K902) O2 RETURN UPSTREAM CIRCUIT OPEN |
| 2/1 O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .