Possible Causes
| Possible Causes |
|---|
| HIGH RESISTANCE IN THE O2 SENSOR 1/1 HEATER CONTROL CIRCUIT |
| HIGH RESISTANCE IN THE O2 SENSOR 1/1 HEATER GROUND CIRCUIT |
| O2 SENSOR 1/1 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .