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Oxygen Sensor: Testing and Inspection
OXYGEN SENSOR TESTING A Tech 1 scan tool has several positions that indicate the state of the exhaust gases Oxygen Sensor
(O2S) voltage, short term fuel trim, and long term fuel trim. A fault in the O2S circuit should set a Diagnostic Trouble Code
(DTC) 13 (open circuit), DTC 44 (lean exhaust indication), or DTC 45 (rich exhaust indication).