Diagnostic Aids

Normal heated O2 sensor voltage is .1-.9 volt (varying) in closed loop operation. For additional heated O2 sensor specifications, refer to SENSOR RANGE CHARTS article in the ENGINE PERFORMANCE Section.

Fig 1: CODE 13 - Schematic (TBI Federal) Heated Oxygen Sensor Circuit, Open Circuit

Fig 2: CODE 13 - Flow Chart (TBI Federal) Heated Oxygen Sensor Circuit, Open Circuit