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 |
|---|
| EXHAUST LEAK |
| O2 SENSOR 1/2 SIGNAL CIRCUIT |
| O2 SENSOR RETURN CIRCUIT |
| O2 SENSOR |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .