Possible Causes
| Possible Causes |
|---|
| EXHAUST LEAK |
| (K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (K902) O2 RETURN (UP) CIRCUIT SHORTED TO VOLTAGE |
| (K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO GROUND |
| (K902) O2 RETURN (UP) CIRCUIT SHORTED TO GROUND |
| EXCESSIVE RESISTANCE IN THE (K43) O2 2/1 SIGNAL CIRCUIT |
| EXCESSIVE RESISTANCE IN THE (K902) O2 RETURN (UP) CIRCUIT |
| 2/1 OXYGEN SENSOR |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to *PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .