Possible Causes
WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND |
| O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND |
| O2 RETURN UPSTREAM CIRCUIT OPEN |
| O2 RETURN DOWNSTREAM CIRCUIT OPEN |
| EXHAUST LEAK |
| ENGINE MECHANICAL CONDITION |
| AGING O2 SENSOR |
| CATALYTIC CONVERTER |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .