Possible Causes
| Possible Causes |
|---|
| (K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (K908) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (K243) O2 2/2 SIGNAL CIRCUIT OPEN |
| (K908) O2 RETURN DOWNSTREAM CIRCUIT OPEN |
| 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 .