Sub-Oxygen Sensor: 3.0L
- Warm engine to normal operating temperature. Check Engine Control Module (ECM) for stored diagnostic trouble code(s). See RETRIEVING TROUBLE CODES in articles listed below:
- TESTS W/CODES - 4-CYL
- TESTS W/CODES - V6
If sub-oxygen sensor or circuit fails, a diagnostic trouble Code 27 will set in Engine Control Module (ECM) memory. Clear diagnostic trouble code if present. See CLEARING TROUBLE CODES in articles listed below:
- Drive vehicle at speeds less than 50 MPH for at least 5 minutes in 4th or 5th gear (M/T) or Drive (A/T). On all models, fully depress accelerator pedal for at least 2 seconds.
- Stop engine and turn ignition off. Repeat steps and note if diagnostic trouble Code 27 exists again. If trouble Code 27 exists again, check sub-oxygen sensor circuit for continuity, shorts or grounds. Replace sub-oxygen sensor if circuit is okay.