Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| (K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (K43) O2 2/1 SIGNAL CIRCUIT OPEN |
| (K902) O2 RETURN UPSTREAM CIRCUIT OPEN |
| O2 SENSOR |
| PCM |
Always perform PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.