P0138 O2 Sensor Circuit High Input (Bank 1/Sensor 2): DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	Check short circuit to battery on rear HO2S	Short to Battery in signal harness Contact resistance in connectors Faulty Heated O2 Sensor (HO2S)
Enable Condition	10 < Battery voltage < 16V No relevant failure 10 < Battery voltage < 16V
Threshold Value	Sensor voltage > 1.3V
Diagnostic Time	1 sec.
Mil On Condition	2 Driving Cycles