Sub-Oxygen Sensor
NOTE:
Sub-oxygen sensor may be used only on varied applications on some models. See the OXYGEN SENSOR APPLICATION table.
Sub-oxygen sensor is mounted on exhaust pipe behind catalytic converter. Sub-oxygen sensor may be referred to as an oxygen sensor. If sub-oxygen sensor or circuit fails, a diagnostic trouble Code PO141 will set in Engine Control Module (ECM) memory. For diagnosis of sub-oxygen sensor and circuit, see Code PO141 in the TROUBLE CODE CHART in the TESTS W/CODES article.