- DTC P0136 or P0156 indicates the deterioration of the heated oxygen sensor. The ECM sets the DTCs by calculating the
impedance of the sensor when the typical enabling conditions are satisfied (2 driving cycles).
- DTC P0137 or P0157 indicates an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM sets the DTCs
when the impedance of the sensor exceeds the threshold 15 kOhms.
5. Heated Oxygen Sensor Voltage Fuel Cut (DTC P0139 and P0159)
The sensor output voltage drops to below 0.2 V (extremely lean status) immediately when the vehicle decelerates and fuel cut is operating. If
the voltage does not drop to below 0.2 V for 7 seconds or more, or voltage does not drop from 0.35 V to 0.2 V for 1 second the ECM
determines that the sensor's response has deteriorated, illuminates the MIL and sets a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
Heated Oxygen Sensor Output Voltage (Output voltage, high voltage and low voltage)
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