Possible Causes
| Possible Causes |
|---|
| HIGH RESISTANCE IN THE O2 SENSOR 1/2 HEATER CONTROL CIRCUIT |
| HIGH RESISTANCE IN THE O2 SENSOR 1/2 HEATER GROUND CIRCUIT |
| OXYGEN (O2) SENSOR 1/2 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .