Possible Causes
| Possible Causes |
|---|
| RESTRICTED INTAKE AIR FLOW (PLUGGED AIR FILTER) |
| LEAK IN THE EXHAUST SYSTEM |
| O2 SENSOR 2/2 INSTALLED INCORRECTLY |
| POOR CONNECTION AT THE O2 SENSOR 2/2 HARNESS CONNECTOR |
| UPSTREAM AND DOWNSTREAM O2 SENSOR HARNESS CONNECTORS SWITCHED |
| O2 SENSOR 2/2 |
| ENGINE MECHANICAL ISSUE CAUSING O2 SENSOR CONTAMINATION |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .