Oxygen Sensor: Testing and Inspection

The Tech 1 scan tool has several positions that will indicate the state of the exhaust gases, Oxygen Sensor (O2S) right (Bank 1) and O2S left (Bank 2) voltages, short term fuel trim Bank 1 and 2 and long term fuel trim Bank 1 and 2. A problem in the Oxygen Sensor circuits, or fuel system, should set a DTC 13 or 63 (open circuit), DTC 44, 64 (lean indication), DTC 45, 65 (rich indication). Refer to applicable chart if any of these DTC(s) were stored in memory.