Possible Causes
WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO GROUND |
| O2 SENSOR 1/1 RETURN CIRCUIT SHORTED TO GROUND |
| O2 SENSOR 1/1 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO GROUND |
| O2 SENSOR 1/1 PUMP CELL CURRENT ADJUST CIRCUIT SHORTED TO GROUND |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .